Malicious PDF — malware analysis report

Static analysis result for SHA-256 e931e60ea5083609…

MALICIOUS

PDF

90.5 KB Created: 2021-07-22 19:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7044dcab42445121afdf283d8a90d5fa SHA-1: b3921f629e7319ed003445c042dd2e69fae0d597 SHA-256: e931e60ea508360928f51e4a34c605e541797db4eccc12e6bc5f187756c4cb72
164 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to domains that appear to be compromised or disposable, suggesting a link farm for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan. The document body is unreadable, but the heuristics and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/757550b221ea44f5f2c3fe54564d9fc5/61154350834.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/tapikosudinujiwa.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/90158558493.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/f56dnqtnhkalef907ul1g17u59/80018508104.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c796d0cb4572725df7f22d80fdec61ae/kufewozubiwuw.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/49427284574.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608218fcd9630---61265328825.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3fd0cd28---tovaxevo.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/60304430780.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d575258aeac21b3bc0d543afc51a6c63/zetiduguzifitofezu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098219a26b26---95273776358.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/amd73q2fpo87f6kbu9semc795u/44286583353.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8d792ce5---42855472446.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/kovawinixujo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60562806---zopenopetubaw.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4082421251c6210182a8cbeac025bf69/jemapowe.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/lodubulapi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/0id4342a29dg4oej030tqmena5/42258247081.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/25017362320.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca811c7528---96989505265.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/36223067901.pdfIn PDF document text
    • http://ridendo.cz/files/file/bexitevapopixadukadi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/691f50f1ddb70174004cb9fe3fc18a76/35780860212.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/kufut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+last+lecture+chapter+2+summaryPDF 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_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 17384 bytes
SHA-256: dd41546042c275eb750864ddf45f69774f50b740ad01b1200f3ea3d719cebb93
font_02_sfnt_off00014388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14388 10620 bytes
SHA-256: fc5fead025220eec0a44e310dc9f9b1194f7a642029aec3a12541dfaf85d16e1

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