Malicious PDF — malware analysis report

Static analysis result for SHA-256 1304c1d2fbbcf5f9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 00:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1842a98479c2c5ca4329a21f1eda9f5 SHA-1: ca3a25be1608bdb4a81b5d2c713d968cf6b43834 SHA-256: 1304c1d2fbbcf5f9d8b143eee6fce600f0d6a256290919eee2bcf8cd760697d3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to distribute content. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://majedalkarkhi.com/pics/file/46109814313.pdf In PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/bekebipemo.pdfIn PDF document text
    • http://atya.eu/files/file/89921268110.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/93149365093.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134566f23fb1---33423657964.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3ae6e4021---9577140125.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/retekog.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316dca4b268---63697625984.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/punoborum.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0qvcgt4epv1b30akjj97i7vtut/77093108334.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132a79155a8c---kabaxilenev.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/gemogolejuw.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1769bfd7---jigozujo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf7d8dc6f---vorawatekezuwuzikanag.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/77320516144.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/91938944869.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/36889761754.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/9681005532.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/20752300615.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/banuxedumulepixalawerom.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417b4c94803---sebuw.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/91926157372.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/liwurexavofew.pdfIn PDF document text
    • http://baoveantam.org/upload/files/86007863682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cbse+12+biology+textbookPDF 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_off0000d116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 10568 bytes
SHA-256: 4ec5489d7bed705f5db73a195ff63556e16771ffb1a252380927eb76b456094c
font_01_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 18784 bytes
SHA-256: 64cd6445354fb6daa913e9f0c01b82b1fc3b2d4aec39cff3f7f9d4733844adf0

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