Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d35099d69ead1f0…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 03:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 696215e3fdcfe2f50863cebbe6880720 SHA-1: e3aaf7106c19ccbe51ff292fedcb7a09b8e8fa93 SHA-256: 7d35099d69ead1f016f8f4b9fa8b0e7b13819576f8b93e2f0cba467fea4188ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic findings confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=150000+usd+to+inr PDF link annotation
    • http://travellightnepal.com/userfiles/file/kivuxutudedufido.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb050771fe---fijek.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076332ebb5b2---vibemoverezegigozab.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c4d98666980830b9e1dbea40e8e83aa4/wasafokumiwik.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43b9306fa---35188131089.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7a71b5f1f9036c20c0cd737024254403/16266891478.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/16063176850.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/oq64aagpsimdibgmtjerrunoqb/65491721100.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cba6ba93c72---pimekarozedufow.pdfIn PDF document text
    • https://faprosid.com/file/logapidixirevijamejuji.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9a0b6f3d706529b3e8ed08692a583691/pobuvo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd2132fef---58041977798.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b255a708a9b---59618941400.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/05982925e23736ae9760da9a6f2908a4/15827737339.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1k2lfgl0ubfqivcs7alo24e9r1/woxulutusojidamefo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/224637cf7f034bf6057947693c229eb5/61457300676.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf725291e44---24876218346.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/69574364014.pdfIn PDF document text
    • https://activepymes.com/pub/file/61723227078.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/tivizuvo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sk08bhq79nasojvsdknldebtuh/94046133353.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160859dfbb8ffb---nipumijelajajoroget.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee76a7ebb---likisizuxikigulikiwejigud.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/domisarasodotajunav.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/xemobilete.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/5678154984.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 10212 bytes
SHA-256: c1e5aa6bc8331613fa08dc44db70911efccf8013ac5d271c3db70b502ac2b642
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 17424 bytes
SHA-256: 0374d49f15e6580dc72ad5e6711ab71febfe76b73eb9409f3b0186588eee50db
font_02_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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