Malicious PDF — malware analysis report

Static analysis result for SHA-256 288a70acfbf9f5e3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 04:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99baf52ec2ee9e207d3dba7f5798aa8a SHA-1: cbf7685cd5be5c0fcf7a478823e9dea8a98b9337 SHA-256: 288a70acfbf9f5e3c17f8946cb7bf46ecc73812fecf70bbe6b851d9190300c46
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update, a common tactic for credential theft or further malware deployment. The presence of numerous links to potentially compromised websites and file-hosting services suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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
  • 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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/af166a21e93d0cdf27361abe337da61c/38015650196.pdf In PDF document text
    • http://safires.cz/ckfinder/userfiles/files/89819101134.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/23838067166.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161419f73bd4ee---46186060875.pdfIn PDF document text
    • http://modern-pro.ru/files/file/lebupifatufujogovu.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109160545348764.pdfIn PDF document text
    • https://cartolmania.it/file/1815050773.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/zilixogavune.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/rarerizimomopokeni.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80708404a---20565479916.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/jetupidajesurome.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/63771801551.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/78927773870.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eee49724f---17901419541.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb238e0c8f---razulasalerinomiz.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161393366a5df1---78811965739.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/38232842991.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/gazenotevonevesorivimoj.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/75474254035.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/zelawadukiluvava.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_0CFB384C9BB4EABD.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ds2ei4t0k9n1i5s0k5gkhuo61r/durewexosizadoxefovo.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/7855099404.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/putawedopukatesogazis.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/97828243181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=instagram+all+photo+viewerPDF 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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10804 bytes
SHA-256: b0f895ef95099d69932afd4c1fe1d5d44b8c9e03f8c45ec055aca08b851836bc
font_02_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 18728 bytes
SHA-256: 9a84794754b6f85b7479e58b3a4f878d4bb88381434f6f6fbc6bb2b091121173

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