Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e64bc9bf7950a0a…

MALICIOUS

PDF

138.3 KB Created: 2021-10-07 20:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b16ba250c0bfbbd5447e8dcd1ed35f8b SHA-1: 1b736b244b988107dda32cc13e6d946f5989c908 SHA-256: 6e64bc9bf7950a0a71efe88b6d122531c9d85ab86c5bf1db79a3eb675d5c9baf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URI links and a link farm suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=creo+part+modelling+exercises+pdf PDF link annotation
    • https://artgallery.devctn.com/ckfinder/userfiles/files/dikamizezezogokonasadi.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/7924737537.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/febomokumokitopobimewo.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/lasofipolixufiravukuruj.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/dumosupusubelu.pdfIn PDF document text
    • http://goref.ru/files/file/jeluza.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16152e33d0329f---61863184573.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/05ebd0a1a23fc5e843fbf978f6142d7b/witugosimopivigad.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kakawofapexowazi.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/lisoligibugovudizaner.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/99204323434.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/80069811254.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/5040254110.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/dopavu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b55299105d---42403755374.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/luruxopujutajifu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7c4f1a7b0de4419a714aeb787d6c5180/51510029992.pdfIn PDF document text
    • https://estoniapools.com/contents/files/33408249917.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/10696392800.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/xigebuletabu.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/sutujuv.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/69370226661.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/dirurofusoxozojajuwujaf.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_off0001b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD0A 11096 bytes
SHA-256: df8a8546362579d2dcc989fb95d5b4d0d4f66d995603aa1c7d2ce00c0e20edd4
font_02_sfnt_off0001e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6B0 20120 bytes
SHA-256: 7137352cb9b8530b28c405187327bfc6d38c7b4b4343b458a7eaf19600b89bea

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