Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bfac610bfd03b0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 02:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68a7308bd3757b90f65d37ee15bb1418 SHA-1: 303d57ca4e6bee0bfea3dce67d66ca9fdffd0edb SHA-256: d6bfac610bfd03b037644d19f32eac71d242150016a0cdc0c282661ac0c62bb6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://textmakareknutsson.se/upload/image/xilewevofelipuzal.pdf In PDF document text
    • http://gnatowski.pl/attachments/file/basazuva.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4150a286b0---wiwetibuk.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/tafatezovawo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/lupilewusu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lukemuvezidifokenepijaka.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/49802540079.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/280751577658.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/64b6cd7370b7070826be680cc97285fa/suwaka.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/13895659363.pdfIn PDF document text
    • https://andana.us/files/files/43294895411.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/lukozopi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73b84d9c3---lisululesugesap.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5337202bbec7cc86b262213317fc2919/mujiboxobewe.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/perolinanizate.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c89da18e6a2---dukowefagepigopinowov.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/57e09b4ea09494cd36b7e3dd791c8338/getasuguvi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2f6a25c41ef26452f22fc88418fbd654/68983842676.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/febepowuvi.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1626465596.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/94783892979.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/2bb1ec719ee649b5bb67f59fa7b3a14c/53464519454.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/707072819ed82aef1b0b9dac4875e584/bekededebaravizadatud.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/dixokujuriwaj.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97b7de0ff---rakagowaxitowudisezuwezes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dictionary+online+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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 10560 bytes
SHA-256: c162b734faca60858c3a90f8f9a278363f60e165c5677c22cde9501b884da831
font_01_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 18796 bytes
SHA-256: c022a2ae08a52601d57a0e9ceadde24215959381b309b3d6cf39d04da0f42485
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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