Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a290be8833155d…

MALICIOUS

PDF

81.4 KB Created: 2021-08-03 21:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 252be9551dd05b0a3a2ecfb8f800b301 SHA-1: 127f377c6c943ee3018e4d8150dd78b95861dc66 SHA-256: 66a290be8833155d021c0235c29f5ed29dbc95b828cc01ac6bab0d27bb55ea0d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of these links suggests the PDF is designed to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://sofupingame.com/calisma2/files/uploads/93240577150.pdf In PDF document text
    • http://africa-emergence2019.com/userfiles/file/81461834882.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/warojefuxokojonagisobal.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/loboxab.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c74fed5b91a---19023804919.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a928af4b55b---94125362756.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/lutaj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/bqauf5ff74cv262uln12qg0657/subujaposalofoneverakutox.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4ea769c6fa001681b858d98aeb4e9c45/falinoderorirogi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a61e99580---3359409868.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/bakidamodepolir.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ceujt4htkn62hdel7nobs8qqs5/63269969234.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/vnseam6m3gq7u92dikl6sknkj7/fibodojigitak.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/nofiwemarizivunu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b130c273794---lerupaxewudokekajowaludo.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/22456591388.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sql96t1kqo5j3ek50hfau7614r/ponifefeletiwugu.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/70000240384.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/gofojar.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f4aed187e53dc3adc98341166c65b50d/31070014188.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0btmpbqh0hpf1a6sh7td7fu9qi/73474818834.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/94526094799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cod+coi+cos+cm2+exercices+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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 19256 bytes
SHA-256: 8582960761915adbb32c8ca93b570495691eea8ea77e774d869c64417b1f6aaa
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 10624 bytes
SHA-256: e6aee5d2ec103b8ae1a5a237c5abbd1949d212f684e006109dcc14b791884880
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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