Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a950d4d5da68e96…

MALICIOUS

PDF

79.5 KB Created: 2021-07-02 03:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be71ef1d229e668df93e4f9f07c13655 SHA-1: 765d1087cd6cae87d9ededa8b335f802cf3b4be9 SHA-256: 7a950d4d5da68e961d577659d1ab2e9d131f59b411958091250367ee1c4f5a9f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links that point to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=sketch+of+human+digestive+system PDF link annotation
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6c52b95589620bf6760ed563851bbd3f/detujulevezeluforepodu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/79139923612.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f671644c93---42131242223.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ddc22319ceb8d85338b6f4a2fc0e54e6/45332002187.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/t8i8vo1so20svlbet2rof1tfn2/64476602232.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c40733ece---putimimerujod.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/jamotuse.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/winowogazawov.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c28ed1e9---koloxil.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/uefj89b4fitb6ho7l67h40dcb4/35616498787.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c5b295e4b---69920922502.pdfIn PDF document text
    • https://energooptima.hu/upload/File/48507105533.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eab0b1bf3---potijuwatosoz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a27677d6637---betebapeselawazisori.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/59784798714.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f354a901a085e32b436d2e7e183fe7d8/85071912497.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/52426080783.pdfIn PDF document text
    • https://tomas-music.com/contents//files/gofetexukutitoxe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607360c546692---33533602306.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/jupuzevubipewi.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/35530941014.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rj79rnm0helsd4aoaqe7m38fb4/15613450159.pdfIn PDF document text
    • 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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 11224 bytes
SHA-256: 47e4a3920cf0b0b4f7c4e278c97eeb31128b32447b7378c012382806e074bcee
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16344 bytes
SHA-256: a16cffa1aac5959b841fba18c66af2890f5f8105c86f182f6a3c3a9888ca1a60

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