Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44924ad1d087186…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 17:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cb173ba6214df6472e8cb62052f0b5c SHA-1: 05f68eb443557734a958b0d761cc3df260ad5410 SHA-256: b44924ad1d08718645e7dc7417c6da2ed9e49d19f70d66b30d13b90e07e0c50e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or directing traffic to specific content. The primary attack pattern observed is the use of a malicious document to redirect users, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://podgoricki-klub.me/userfiles/file/94085770086.pdf In PDF document text
    • http://asvpp.fr/pdf/85042520980.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/sijuxabasipivenekaworus.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9bb30eb06da5913f67b8c1523083c679/88638346936.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/vafibemaxomerosobizaseke.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/4535023092.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/niwulomujurofezunatuguz.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/lanalawagoxupi.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/vimifagonaga.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/pufifomowujavutuzawidujax.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3e940d62---98143629464.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143180ebbc82---ruxamexilazikesi.pdfIn PDF document text
    • http://tipiland.net/upload/file/32135777794.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-12/20210912111215629252.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/89372137053.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/14473210288.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///1586186011.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/20672971061.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/20194324045.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/fipem.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d663dbe3c7---puxezozejowagubovapet.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/30091229862.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/30333895207.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/limegakidikuruvonorusal.pdfIn PDF document text
    • https://subded.org/userfiles/file/25408618677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+free+robux+easy+on+phonePDF 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_off0000b9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 11032 bytes
SHA-256: 518b66c56572790427942386b8ec73c84c4abc4b69c9107f4ba047710e1f7a9e
font_02_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 15400 bytes
SHA-256: 8c28ccb3706c5963fb81261bd5561ecf278d52faa7a80cfc993c190296efb1c9

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