Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a9535ec629564a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 00:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44daa46c0ca750a4f111821db8a98ff4 SHA-1: ecec7070d3b250bf29d817cd8f72748c927b9987 SHA-256: 46a9535ec629564a8b6bbb157810deff619d41cede705a0b03a2930ba9c19132
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cecde6a9e5---rapor.pdf In PDF document text
    • http://ahchala.com/img/file/69823744589.pdfIn PDF document text
    • http://willbramephotography.com/30837922098.pdfIn PDF document text
    • https://tempegaring.com/contents//files/lagagixubojijose.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/62941203102.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/28647388424.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jetupi.pdfIn PDF document text
    • http://rideco.hu/upload/file/82487333170.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d772e95d9e3---49090752193.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d76ca2226---22449358806.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/15464536523.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/afhdc0i4t14lk723iqft1ophgt/tufefalalusevanakogas.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/879a1368b6ab8a6373b46404efcd6d21/powipu.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/faboji.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nipiwetazelep.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/27188816144.pdfIn PDF document text
    • http://beta-rc.com/upload/files/xabafukimug.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/magaxetekumerazevumegu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1cdecff4f---9752240260.pdfIn PDF document text
    • https://dm288.rs/slicice/file/15136298997.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/tijoxudewugapame.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ag2cn2jgdbi9lo1fbr3cs01nv2/vazisasurojelokera.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/buwenilupipobufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=high+ldl+causesPDF 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_off0000c1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C2 15644 bytes
SHA-256: 445a92354364594fff261f5bdd5d1c9bf6540667ce8dabe4f7f1a2a01655b504
font_01_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 10316 bytes
SHA-256: 9f6393817892526b6fcc6ac96675f9062ceddd2282784631acb51fb0e9e9a956
font_02_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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