Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f085a8c04ce06a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 17:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8014b54d60e3b4c3993efd9deaddec31 SHA-1: 632cbc3b4be93a81bec1cc30aa74945508f7fea3 SHA-256: 83f085a8c04ce06a4d1b1d339b7fcd5bae9c9d68786bf7100c6b91e4691f7c23
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/uplcv?utm_term=rc+airplane+magazine+free+download PDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5ebf2d4c0355b497cde3a88fc7e440cb/58599905736.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/61547324227.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b7279c05d---sajidekolizukiviwe.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb022d7694---bawino.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/96325703176.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lekikepizovuvirulusodom.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/61412666027.pdfIn PDF document text
    • http://dakmet.pl/upload/70610335411.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/wamomadowapefevadigo.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fajupuzovawewal.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/dibedidojuwulusu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mbkhjsf7on19m1sd8o9sk5hfp6/88875684113.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/39935167802.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771554d4ef2---gadidusejaj.pdfIn PDF document text
    • http://alkanboya.com/files/file///mufujikave.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9571c35430f6c16c935fda10bc208d12/42653363079.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/jenikesetasaren.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/57692188306.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620640194.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pojazekoraxajunodu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c94ee07f06c0af6bd2951f0199364be/tiregeti.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607282948f13f---tudoduxif.pdfIn 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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 17264 bytes
SHA-256: 2a55880c8397446a210e50cbd7b64213d72c97963b2a0ed35b98e6fdcb9b5301
font_01_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 10888 bytes
SHA-256: cb11329177cc6eef66fef7bd3e851c33d82161a7e4a26d39afc7b909b90b0817