Malicious PDF — malware analysis report

Static analysis result for SHA-256 625d03f6e3aa0525…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 11:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8bf210e939886bb48d0c9fafe3291fe4 SHA-1: 06c96d38c46b954d990be934777cd974f894660e SHA-256: 625d03f6e3aa052513f22ae4389f1b6ddb0f314d86720b1e87ef61f244d682d1
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the heuristics indicate a link farm and potential urgency lures, common in phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hurtmar.pl/Upload/file/seralobizeredukelomef.pdf In PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tm24inb2i86tsu63jmd0g6h2i5/14564142951.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a553262e0bc---57910120900.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fcaa8c76e5e4e49a46ec7f4db880f373/39684492287.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa02ac7dab4fd2408307641711a878d5/37379713029.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b175d90300---64132983831.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/dd9e078803a4b0351504925072e37e58/vatokobidetiloxipazijipug.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/39d2e42784f1fa0de573ee14f724eda0/romojaxek.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c046d29821925b546c692e4ff774163a/sulobupe.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/82106227616.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bonbq02tff7u3u5tfrs8oomruq/fadesitunoxego.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/61cc5430debdbb32154364fb9785c7d4/wiwuderijoduzaf.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ebad75ad---95695636100.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/12285458003.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/56476570269.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vagosifoxonomuxe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae81be357---41241545558.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/wotesase.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/felifemuvanatubetimivu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f101167724414f2424565122cd331528/fudefaxekifovixexox.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/lelixugigu.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf569cc539---nowoni.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0b2fd0f991302ba851990d353381aac/sapabozefimugominorel.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/fopusuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=user+manual+instructionsPDF 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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 10496 bytes
SHA-256: 36f4fdd4c410e34995d9a1d880c7faff0593dac0593830ce516a149e44e9adfb
font_02_sfnt_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 17364 bytes
SHA-256: 6a0dfc18fe2675fbdea52b137b72be86382d7dd90f96789f53bd73320c548056

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