Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e45c973d7c3a6c…

MALICIOUS

PDF

90.0 KB Created: 2021-07-15 13:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 526c7eb044c531355b17dbc2b1e7f556 SHA-1: 5f8b10e8b729714229a6b35d008dfe5f9baea1fc SHA-256: 92e45c973d7c3a6c6fe2d2a05495acf4f06a8730c75bed7f47e8b82632331b7d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=aerobic+respiration+in+yeast PDF link annotation
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ke2saggl507ipdj7ft06f480lu/86934708249.pdfIn PDF document text
    • http://turnyras.lt/Files/file/59599130441.pdfIn PDF document text
    • https://wsbtitan.com/images/file/2414376602.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ca6c8cad34b19ebf96a188acf49a9262/70768049655.pdfIn PDF document text
    • http://bociany.sk/media/file/selopib.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/mifimukopedow.pdfIn PDF document text
    • http://findplusltd.com/file/27970595713.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/weziseguwexubedimalufubu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/fimesanonobafetesam.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/divokam.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/73545521888.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/jedinipigexowi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5eee1829042e2a4f7b908f00912049d7/87033084512.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/ruxiwi.pdfIn PDF document text
    • http://ekotronic.eu/files/file/68694484060.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/e7457fbce00c7f9c6934681d69b41593/pibexipolumaborit.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/ruxepi.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/99781688574.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/21058754493.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f79d700b8b3e93a17d5d3b541a549953/59355528974.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/51554688108.pdfIn PDF document text
    • http://fittbikese.hu/files/file/67259177130.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_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 18548 bytes
SHA-256: 2e768482796f64ccd0959abf41498b13a5f6bf7826fb0c2709b8610afebf2762
font_01_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 10556 bytes
SHA-256: 322c583b5f699b4ab5ab9e4a708d588308fd5b138e51fbfbc13fabcddae8d4a0
font_02_sfnt_off000142f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1