Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d039ba9fdac5128…

MALICIOUS

PDF

83.1 KB Created: 2021-07-13 19:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ee40e1b18075c75d996100dd07a1ac0 SHA-1: 945a03fa3d0868c5962fc52305337abf1ffa60fe SHA-256: 1d039ba9fdac51281799874aa44508e4d12b7ed589c07fede1a1eae1ec97affa
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other domains, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. 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-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://aneri12.eu/res/file/xababazumokorekotasa.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c583254c5d8---sobumef.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/btnva1mc8qeo6ccn84me7cij8r/65464906206.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4ec83b55b3dee7a29c155ae23bfc26ea/8479527821.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/91475712790.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tqjict1745hmv63aur3ebqb9me/75966101404.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9a52cab31d5a2f353499048f0a2dd12d/zagigupifuw.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/7596057149.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/c0ab3rd9nu02815td9btmrr3mf/zokuzadupelavuromuroru.pdfIn PDF document text
    • http://blueyee.com/upload/file/052303171374.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5fd638d696c37gfdkjisd1e4v8/gudunizodegutud.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/98182156568.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i4iqjhb389n8nno932q2cnuptl/94243258705.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/39011774863.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/69649647446.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/fumifekupufedenajogajavom.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515564f1b2---gevonobugufitifejawuge.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/2896132503.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/mupujekajuvalimuk.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/97127687753.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vabixopaperanogogajimilud.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/75907322566.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8cde9aee---pirokilesitizod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cups+to+tablespoonsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 10324 bytes
SHA-256: 979a61c3013e46b7de460a0ee53e896a097a11f4e4f918f016236364c642f502
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 16828 bytes
SHA-256: c48571caf0e609c5d67fb1bb7478f450aaa4c2cf8e9ef9ded284e93182f6b4a3
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1