Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3412b582908194…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 20:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53bc7b04bd0174518da0128c0e01b94f SHA-1: 9f7618d628486ae14c9229afa03b6ac5891c88da SHA-256: 2c3412b5829081940234c41e8cd7dde8b06f47df498e913386cb6d332732df0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/8e9jpajbtlsokvuq6hievnooan/lozokonerojifora.pdf In PDF document text
    • http://gerocuki.hu/user/file/zixipi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/wilaga.pdfIn PDF document text
    • https://hirurgija.me//files/kubokivoragofikomure.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/tularumugofijivag.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/87828433442.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/34129216736.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/302272b527f08ae1c72a87e4808bd174/veluxuposuvipozitusuno.pdfIn PDF document text
    • http://runhouchem.com/upload/files/71591181484.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/h3uo2vv0bmrgi51smfs9lv7aog/nasesaxokugavejalevos.pdfIn PDF document text
    • https://ijpdua.com/contents/files/pizavimus.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/rolef.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/52093803458.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/l9ra3j0669ff3to3gd9lv7k3ga/85280076833.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160972569bc526---likasofufevuvojoredavaz.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbadf1ca62---26530805551.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/87933002931.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vjsgagsji2um12k6lk9cpaq2nd/46048115669.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8984c63a1237cd84c9198d87e83fee29/16482132039.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fevesotabimo.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/58143283798.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e917c6d15a---sotogikilapopuvul.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc9785502f---mofugopekoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=law+of+attraction+12+month+planner+pdfPDF 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_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 19208 bytes
SHA-256: 023e374354b81d61696aacea232d1b8eeaf25bbff01164ed726881824317319d
font_02_sfnt_off00012d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 10932 bytes
SHA-256: 3ace7c7a1af072262d6dab1919643ca3e551dac791d47c08da13e456fc945499

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