Malicious PDF — malware analysis report

Static analysis result for SHA-256 6514b85563a1ef53…

MALICIOUS

PDF

92.9 KB Created: 2021-09-04 18:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6aa1dfc861de6dcaf1da64e3518fa7d SHA-1: 9bb75af7eab11e026715f57c9b24956a8592b076 SHA-256: 6514b85563a1ef532157a32f0b8bb9f0a265de8c264e0c6b38f05ae53c92e04e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm and a callback phishing lure, suggesting it's designed to trick users into contacting a fraudulent support line. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://digireg.lu/upload/gonemirutuverimofujise.pdf In PDF document text
    • https://badoza.net/userfiles/file/73001011381.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161121cbdccddf---58543815557.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/xodosiros.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/wonubilanorozagi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116d6cd66b05---disejekiwub.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/nadekunobijaramive.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/23933329139.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/ruguzizi.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/26648003820.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060220530873499.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wakolusovizaw.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/71612762596.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ngu1akh3fcn5vuh7l7vo6k29uq/zororirapovugosonim.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081709144673499.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae19c5d74---56562566977.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/foliro.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9929ce81---kigigavuwunitomaduful.pdfIn PDF document text
    • http://aps-mes.com/files/file/mivorewigoludi.pdfIn PDF document text
    • https://autopratichesas.it/file/buzixopavotigitozufipo.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/dilafenunuwamurirejuranep.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda9c246b71---62747258647.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pevufigepivinil.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5p2kaln3ul9psgai09mvdgd8gs/76801570901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lumbociatalgia+aguda+pdfPDF 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_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 19212 bytes
SHA-256: 071e780029317b024149ef5ff0b91bb8a76c8e33140d5fa637a80eb636176764
font_02_sfnt_off00014e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E36 10656 bytes
SHA-256: 41923fae94140410605d0bf6245e05dcdd7bc1c422a9fbe15d5edeb63cefea02

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