Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85b06c65c1abe79…

MALICIOUS

PDF

93.5 KB Created: 2021-09-08 10:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ba6067dceb2c39c6bb47a5f6f0d68a1 SHA-1: 548f6a058e93e446f5061348436e9fb0dfa6f23d SHA-256: a85b06c65c1abe79a9119fe5414858c801654d41069128571e36598b8b00b117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple PDF files hosted on these compromised sites indicates a potential chain of malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://logo4you.dk/userfiles/file/videni.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e373ea85f2c---53554735608.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/70394783749.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/c9dc560a6989907469725653009b5d11/ruxironiked.pdfIn PDF document text
    • http://dges.in/userfiles/file/34240400814.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/vugivimak.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/89746691330.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f695b499c4---26750958744.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5190d9d9132cf926770dfa76178484b6/wufomonegel.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/isiimh75jf3up835825fa5jcij/wibom.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/28595719964.pdfIn PDF document text
    • https://puppometalli.eu/file/gufog.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/823db65d14174213264fb35abe0f1e2c/bovagesedevakela.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/12508955638.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/37336420252f6efe831a112a263ad650/51075126598.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ur13g6bu14hekcl078fpdl77e3/redotasusofepemo.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/31240609002.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9905679a0b193fc7b8bb481c0330e6d1/72855776628.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f772ffa6f0f611fe1dac225c89cf12c4/90538667056.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/43311937687.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/37643812219.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/wukora.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/da7c070b646d836f414c1427e30dbde0/tosajojujojofi.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/28940604042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fha+streamline+worksheet+without+appraisal+2019PDF link annotation
    • 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_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 11236 bytes
SHA-256: e0c723613f1718f8407894080e65429076f704e30bb33b82684de78f2b2e0057
font_01_sfnt_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13977 18004 bytes
SHA-256: 4dbf50469111dcf4d0a487c816452c0fba5c1747206fcc0d63538d19732e03bf