Malicious PDF — malware analysis report

Static analysis result for SHA-256 062e9bf0a6ca503a…

MALICIOUS

PDF

81.9 KB Created: 2021-06-30 21:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 53e03f32e7f314627bc7c5e25bcea949 SHA-1: 10f525c525a48b3f261386876dbac267504dab05 SHA-256: 062e9bf0a6ca503aaaad245ac074cbdf70477bee68fd4aef9988a5d32d319e40
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing lure, specifically attempting to trick users into installing a browser extension or update. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting, combined with ML classification and ClamAV detection, strongly indicates malicious intent. While no scripts were directly extracted, the document's structure and heuristic firings suggest it exploits PDF vulnerabilities to deliver a payload, likely involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=houses+for+sale+in+holdingford+mn PDF link annotation
    • https://adepotcustom.com/UploadFiles/file/20210501015009188.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/87474fa91ff1d7bbcfa106fc882d829b/pebofolaneluvugip.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5bc26bd5---20865725565.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf237617b4---45845217263.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a92cd5af2c0---6108788653.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/jogijiletesuwuw.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/tubupurejikoxosopa.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/a484022d04e22221e4694619bdd8f15a/74029251240.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/zovunenesedobusek.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/88728575942.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/62360232a8055bd6fab9d5e0a1c8d6f4/54048700377.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/caac9cef7ea29463bf6b95732f2fcf25/zixewigudof.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/21bb29d06527b728c485c00470ca0810/35580459477.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/66476797294.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/99963185216.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da1f008ec0---52897260676.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a6bd3f01a65820f4e6733fa42769cce4/29403286639.pdfIn PDF document text
    • https://hagepoorter.be/files/files/bivarepikazixa.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210510012538_1213237715.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/22861408654.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/nareleg.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4949db45---fevotisunezalujasivo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45527f24d8---98409001953.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/zowum.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/n4pe384i3uaagr7tda3cbfetus/25152355088.pdfIn PDF document text
    • http://builderall.info/userfiles/file/rakidivekivu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 17612 bytes
SHA-256: 6248266c85f31223724866aa26586e498ac1877e37eb7a379762a19efe0ae5aa
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 10792 bytes
SHA-256: f1dae0908c4b5b1279839dcd07e406834d9467eb7b4f5e87ad08310436d96b6d
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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