Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcd13663895b325…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 00:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23c40b8614594e1f8950ea60dd84d092 SHA-1: 746b4ff386261cf90b36cefa6f8b434beec8706f SHA-256: 0bcd13663895b325f1a72a8a8896161e27957b701102f17e92f98f8d4a30095a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised domains or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be social engineering through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://granitabrasive.com/editor_up/49574103406.pdf In PDF document text
    • https://museuminiaturesbesalu.com/files/70812869057.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/41451599770.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pisoralemo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152310dead17---40509818810.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/79268642927.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/setubij.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/44170785865.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/15553529929.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/80654835017.pdfIn PDF document text
    • http://schubert-hh.de/image/file/gowodoxipezifa.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/dopitufavufumubepovazu.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/99889977469.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613484eaded66---dutawixefitezesadot.pdfIn PDF document text
    • http://dfanchem.com/upload/files/simatusaxaje.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614eef2b49343---diligulomiporoki.pdfIn PDF document text
    • http://princeverma.in/uploads/files/26374238865.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/zukinevisovebu.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/89522059549.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/pomixetutuvekedakepuk.pdfIn PDF document text
    • http://risme.vn/files/xupuzutesowomiz.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/sizapudaput.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613291ccae746---41360973539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=checking+android+battery+healthPDF 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_off0000af64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF64 15228 bytes
SHA-256: 4c50d99cffc070f22458b9b3b04774a0fe3e47f5392f29c9edbc3a45c3ab5299
font_01_sfnt_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 10860 bytes
SHA-256: 54ae9ef93576587ad5e7ea351321046fb1f5e5a47f5c9aa13829fc863b1bb4e9

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