Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ffa550e9c16546…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 15:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14711be19cba84d18e1d6d9b3fd21b58 SHA-1: 4cf2bd2dd2fbb81ba9edd96497348c7422918d5b SHA-256: 94ffa550e9c165464dd4d8536969b8654e96316080d072d272f4464c395d001b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://angelofthewinds.net/ckfinder/userfiles/files/79835315885.pdf In PDF document text
    • http://t-groupvnxkld.com/uploads/news_file/wudejazelonilosotu.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/76466428724.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/zuvebosoduvugotizilelov.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d68da459---keripuxufoborevivufi.pdfIn PDF document text
    • http://www.polni.si/Images/files/nowozegitizomijiv.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/47038598755.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/26843246320.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/88346947718.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392476dd697---julajowobogunozarozej.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/juxokezosonurokajitaw.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/xenawoxo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/98368634884.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kce3cis0jksrihaodd2kaok9h7/10681450066.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/tedaxewopovugiw.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gesaboto.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb07cc9de---nitolidunidovi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5be3d72e---73110792700.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/71501149267.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/62927669419.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/fujodugazif.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/vakiwusule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+story+instagram+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 17320 bytes
SHA-256: 21b8f4582abe68b257ee17a95ac9b0199016b26ea9eb386d6eaa94c07228de1a
font_02_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 10660 bytes
SHA-256: 1d047faddf72a690a608426b38f3e249553fea964a68046eb66bd97c83a9ab17

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