Malicious PDF — malware analysis report

Static analysis result for SHA-256 9670799632b4374e…

MALICIOUS

PDF

87.6 KB Created: 2021-07-13 19:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d771774ece13a7679dd510091633703f SHA-1: 517e9bd5718008dd1ee9504996228d32ef461cfe SHA-256: 9670799632b4374ee1028af87209ecce99b43c02ebe831c76c3d53483951756d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://archism.ru/uplcv?utm_term=present+perfect+present+continuous+exercise PDF link annotation
    • https://tortugafilms.ca/adminfiles/file/suxisu.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/fijogaxosufuwiwowesijevex.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/96924325e85c1445d6b1c52873541caa/ritudemapad.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/milevikinewowo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1a1e28664---jafubosavivud.pdfIn PDF document text
    • https://x-software.cz/data/file/43037979402.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/83027474344.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/vk77v6ca4v24e5f4oues95edmn/85876829894.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4af6a0e97---titan.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/ripojapipeseruwafun.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6578e592c---60940480417.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/43569501028.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/sasim.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840bd230f33---vamilewuwasuvopugege.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/37477180971.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e1163d07b---79963082076.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/paxipogatikunufekofo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4a360a7bfd0a43e096c8c249bd984dcb/4484947157.pdfIn PDF document text
    • http://wirheiraten.de/images/file/sigazapewudagone.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b11363f25fc01f28199efabdb0b2e76c/kabaweromekoxusarum.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/vekofajadujokaw.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/rometafabanafafasimozok.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45f854aad---31017010876.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_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10468 bytes
SHA-256: b36373c21b501e23d58573b900bef88e905333fa3abc276ecc1153cae9f69f2b
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 17224 bytes
SHA-256: 696e1e242898fec18acbb31f8719737bd0c48ed0024381cec9f71c07e7d82523

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