Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec537b21f8bca4c5…

MALICIOUS

PDF

120.5 KB Created: 2021-07-29 21:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 87ffdc1392118ba07020d16cc7436efe SHA-1: d838c5ecd1749a4bb0cb19097ad696358e0fab10 SHA-256: ec537b21f8bca4c535f81ce881205eb88b5e3964f27c88fc2d70702970536e11
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm used for SEO poisoning to lure victims. The presence of 'invoice' or 'payment' language further supports a phishing lure, likely leading to the download of a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crewmak.ru/uplcv?utm_term=silver+maine+coon+kittens+for+sale+near+me PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7796450a61---somopamukira.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5e951e40e35b7ed18c32f4e350b1de5c/dosafewusejukupoparogot.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qpc9vecrvogi5ium3e18so3i01/tijivebosifatilog.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/musiximizetupunibogul.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608662acf2339---kasarumovega.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/53628652830.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5125rojorkuboseelud1mfili4/malikovolalipibe.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/fajamaligo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081523f54d1c---bopogifeb.pdfIn PDF document text
    • https://pubgpin.com/calisma2/files/uploads/getositabubogowupamefutun.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/walodebufipumanirutimeg.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/pimiwimo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608478483eea9---61365086937.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3aab140bf---10972828366.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/gawozuwixoroven.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r2l3cqbd8aima0d799oohsore2/82798485088.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/ziwepalokizulipikipedug.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86220cb736---sudutejogosagitidu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50538753158.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89673653375.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c10a8a8f---62065328878.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/36607402595.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

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_off00016ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF8 10728 bytes
SHA-256: f960a32b59d5d0aa7c4720fd9172d299633f18c83f7bdffa36c97c125ec542c4
font_01_sfnt_off00018894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18894 18924 bytes
SHA-256: a508c3a7db0a1272c885552e987c63ab5bf6d51b41e24efbc35f1b13420e2903
font_02_sfnt_off0001bb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.