Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3cf9d97a15619c…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 15:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c5c56126d047edb19b5d1c640f6eb5b SHA-1: ae00f4d963514e5e4ef672a9a0b43f78b39df8e5 SHA-256: ac3cf9d97a15619cf508a67fa9d29847b7cbb53b6becf9889a2cbe1548b3946e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aihyang.com/userfiles/file/totegodoribif.pdf In PDF document text
    • http://t-eamplus.de/web/editor/files/mumob.pdfIn PDF document text
    • https://estoniapools.com/contents//files/41163325462.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0a384c5093fe66b4614b9db9ced94e5/wilovukolaxebuwubunenaxor.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/sazidusatasitapew.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nabowutisujamiruda.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zabotewuxatugukejume.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4b360090---vizub.pdfIn PDF document text
    • http://akssert.com/userfiles/files/28106899694.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/niluvuzudovod.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/gp0mhkm10j2f6blgdae2hl4q86/kiriwitox.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xelivokenipumabuwad.pdfIn PDF document text
    • https://digireg.pl/upload/mepawuniremisem.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/77044285305.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607546069d15c---85503452745.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/vukevipipekezorak.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/941ffe0d08937971b25d3bbb4b4a3a0c/31541499376.pdfIn PDF document text
    • http://yoron.net/up/files/nepimedimake.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a8a7a5f5d---58883697044.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/16223836861.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/vegived.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9154b689a26ae187f710f4e621e3df3c/ritogiwivud.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/14725460712.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/98889275216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=can+breath+of+the+wild+be+played+on+pcPDF 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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 10920 bytes
SHA-256: ce80bcf47f36aa151d61a1bbd8d8c3cb3677ba5f2e9ad4c9de16264bc51cec84
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 17316 bytes
SHA-256: 9e775efb4aa0c177aa2f95be3572bd36292edfe6598f6641646711389281fc82
font_02_sfnt_off000133b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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