Malicious PDF — malware analysis report

Static analysis result for SHA-256 20347c81d12e92bf…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 22:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff954978e94833e0d0d102af318aabfe SHA-1: 98e9560ef312843774d77036752648ee4f146512 SHA-256: 20347c81d12e92bfac31e1979997f4388e7c65df39608fb9c414a32425badd8f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a tactic to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160906735d072f---wagabamig.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf59ed03d---fufozivamebojirajuvepojib.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/18934116115.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f3ae82e1---dirurofaxavowadi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da430e567c5---13168631151.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/3621f3c211a59d54750edb228a8d64be/tevubigeboj.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2558b1b8---lanafavatugasopadajir.pdfIn PDF document text
    • http://robbes.nl/media/files/54367018637.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2cfhoq196o17kvf1sgovrr5rf7/movujuso.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/takakigoziriwuvetavevode.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/67508770496.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d927051e567---95478535862.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/vexoxomixupudigezula.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9ssvfbcpmtjaq9comq7svvgjd4/febiwomugewo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984923ce6dc---teguzojelapodu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/20504623027.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/zabufivavesuvesowumoke.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa0fe0f05---xubifelusivaneteja.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/46a8349b75ec90bad95537f9a7dbc4d3/dafatizamel.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075003e147be---wekasaluxubejamatoto.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/nupetuxumoxapa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h5deu7u526epg5sbeofshmgel5/49102182704.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/suwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rounded+atomic+mass+of+first+30+elementsPDF 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_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 11076 bytes
SHA-256: 987d2a4202c476a6e9415be55a2a0502eeaed9117a0031fae18afac0e3626924
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 18344 bytes
SHA-256: 5235ec9cdcc81cef4171082b5c0ba2838a1b553a499c6d4d96955b2b9c96eff7

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