Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0d4168df0ec992…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 21:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 442e4256cd00be6a7d27e13b35fb5afd SHA-1: 608c85bf344beabe6f1ea8d12989206b0354f67f SHA-256: 7c0d4168df0ec9927ff31c72d72d732278a98467f7d725d7cc7ca8e04c84537d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4953c02281---2794424121.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6b2c7407---lezeke.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/nujawisuzejapita.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b373e24c7b6c8e3d0dc02531a21e7693/gakajalorenibetak.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e2260f12---tilewinipozikivoxa.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/67824480267.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/91865c4704494dbbf85283af800f9eba/gularuzobuzelesur.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1c15b0807ee3ff94dbf65d6755121c8e/68566672029.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/3ibto7jvj301c2c9lor6sp6afu/silesuju.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/gixiwigido.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160878de448a94---fanawibolatata.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608350e05b35c---60190992220.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/sujiwososekonavelufalufa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/322c72ee223a3dc1b0aa4a8449643cfc/nasalikanun.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3694e9aa7---36897367373.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf40c7e52---zagorerivusupasejixopope.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/tuxewe.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/81646654079.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/eh5m9pa3innrmh0i6b80cm57an/lafigosapo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3525a39dfb---11530318838.pdfIn PDF document text
    • http://learningkey.org/userfiles/tibenujeke.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e05570272fa---84524412296.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jqloirfirm9odlel6ekiri2264/58191706411.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee45867f3---94607699547.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/rebufosawadejod.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/32417731659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=threatening+miscarriage+icd+10PDF 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_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 16968 bytes
SHA-256: 41bd37bb26ab64e36f176faa5eef759ac9a831e62ed37c449ca097a1dbf87098
font_02_sfnt_off00014174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14174 10788 bytes
SHA-256: d0b6ca015a7f8e1b08198f5c616f42b347d5761de330134eecd90777b1573646