Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1cfec225a2c377…

MALICIOUS

PDF

85.9 KB Created: 2021-05-08 07:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87eddcebbfa2cab35d52c57292a79b32 SHA-1: 100a4c049bf593b23da045126764090c25e59aeb SHA-256: aa1cfec225a2c377ac1af397c4274e8b869d1a022fbf411c732b2006ef653008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this, indicating an attempt to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pistant.ru/uplcv?utm_term=windows+7+32+bit+bootable+free
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/edbaff763062dfc14b5bbedc414edb9a/14291913699.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/2d2c47c92b21abf0c6284654538a7e5d/teveta.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160959adbb3cdd---66685081647.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f9c6456b---21198789126.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7nfsiohi9eddgl502umf9ftmi1/40230710807.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d0mu9vdkpkimo4q6pd737k9a82/30424032552.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/4696a5d3bce32c8f9a613210c8da526d/31248848857.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a7fc52cd8a6f113007e8525b9b837b60/18985394843.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607994c0e01c8---ritewonudasewisozuvowat.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/8u64i2ald9m9peg6gf4p6r6di9/xavokinokaxufowatoxuse.pdf
    • http://akcjonariusz.com/UserFiles/file/60867908585.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cebe53cbed82b39f6ac3d9ccd99803cc/45559631279.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/m3ml9jm4u9c52g6t9mlbp6m9ha/zibezujisefenamupun.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc21a85455---safot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57a.bin
f95b1fb09179bbed631036638ce056d026614d08dd50e7aaf8e8444ff9841ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 5016 bytes
font_01_sfnt_off0000f702.bin
d695cbf275495ce70001cc7e5e1061dc4c1ca26912ddc826b4b8024b44e04d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 5520 bytes
font_02_sfnt_off000109f2.bin
51b6708d82cbb53381898d900e19ee06047e2eb0d10674c1108cc38ed8343891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 19940 bytes
font_03_sfnt_off00013efa.bin
5d9238f0f520a34b3aa39114dd607dae7c78a30ddd414f7ee2983a84334022be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFA 17160 bytes

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