Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50e229af04599b2…

MALICIOUS

PDF

180.5 KB Created: 2021-07-03 08:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0b174403d2a9dde5d53790cc3635fab SHA-1: e1e116d8122d2a2b01b55a7ad1e1f84cd7ada6b8 SHA-256: e50e229af04599b208eb02864884a7bf7cfc59c8126b0fd33ba5e9f1d4bd9949
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting it's used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9652

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://art-eria.pl/mandarynka/pliki/files/69138822360.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5008bc23031f51f93e0d6afdc1588321/zozotamowopawopav.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/noripusenudat.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ca91f3ac---gigelodufezaxipesabopuk.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0ans0bdcba912t86en9sekjquv/94944407212.pdfIn PDF document text
    • https://auto826.com/uploads/files/vemuvaz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160908b5a251c9---74705392107.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/jozaviwew.pdfIn PDF document text
    • https://comfort8889.com/upload/files/10142186917.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/56511195254.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1224f80cbd---difikobulubepebubelonebu.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/pawazu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6cabe0b1---5934853222.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/fobiseragabezutokoxufotus.pdfIn PDF document text
    • https://rajaunited.com/contents//files/julexidove.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5pok3gkffnn02mrm4cvduvg81d/satotaxonesobukutumi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8590ce700e---lotabadore.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ca632e33---41035247998.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad87c7f069---pematu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1e1f11a49ee9eb27fd713bea4cbf60f6/19229553500.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6866e6709---55173357554.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/a1db095b95812acedb11c551bf1cab9d/25937292036.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/q11jdvbhcr3g2l3npmntglcjv7/78946518522.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lo43thr9qst6ml3cobhrfkca38/dulejigusumozipevu.pdfIn PDF document text
    • http://clarasonic.com/upload/file/vezab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+ball+legends+new+brolyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CAB 10572 bytes
SHA-256: 21d810558aa75aeb430fce6bc24381c42eba5607314065781970d1da4add4e43
font_01_sfnt_off000264c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264C0 18264 bytes
SHA-256: 46224576fad634195f737b2ef70cac72a635bd79a52f77a1380f9af9669e29b2
font_02_sfnt_off00029450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002ac5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC5D 6720 bytes
SHA-256: 06c02371243cfef4ad5716ef49e7ce57d00ea53cea6f6d7949675db87af23de6

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