Malicious PDF — malware analysis report

Static analysis result for SHA-256 3536d6a8bcc7a392…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 11:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e455f7f4cda8a655ca765a5fe24e524 SHA-1: 0b821c63d718d4f4c51622366c3cf3b0806bb071 SHA-256: 3536d6a8bcc7a392059f073b027941998d23c9bcca27386d6e50600cad66bbdd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or malware downloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of instructing users to open a password-protected archive, which is often used to bypass gateway security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=geostationary+satellite+pdf PDF link annotation
    • https://alstar.uz/images/shared/file/boxosolexime.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/kufexaxiwafalolu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/396b815a7070aacba7ab581b28cd1a3f/zipogefalo.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/xenabavorukebulobiwane.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/59glbt2jl2drm7npj4t361rduo/48370890720.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4apbuhk1vosb9td6vfbtcl14f1/44779268793.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8067c6949a---44726326699.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b3a73043ed8abfe3e8e5e8421280528a/18877123125.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3dc5798f6---deduturuzuroxu.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/32723824914.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0634b768---39301195154.pdfIn PDF document text
    • https://eamenfaraz.com/cache/fck_files/file/mipiwaxozututixo.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/78722242197.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/17606386261.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8e2e149c03b2eb3a4e0d191681c0f349/14303291064.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080fe9483b3b---zununijaledamet.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607826bac3e72---36515648132.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094e4aa3d507---83714738322.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba438f6e254---kixurazovaposasusuxa.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/keberedaxakakow.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_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16700 bytes
SHA-256: 4aaa89a1394448f73fe59f4eb88499511d0558a443ee658812c46fb51e5dca4f
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 10644 bytes
SHA-256: 92fc7384dec31ca29ce83eb5076d9f8f83d1ea7505a264fc0f3908ab729f4325

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