Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7905367a4104472…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 20:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c5216466642637658ff8a796bf88d37 SHA-1: f77a75c34366335bb27ae4f0c40dc2e5b5ae4dd2 SHA-256: d7905367a41044728a2c0102fcc670f301455f1f30425b9b071c1025f9b65d71
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised CMS uploads and disposable hosting reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/39057928408.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4054573379.pdf
    • https://bodymart.in/ckfinder/userfiles/files/17289083023.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b71caba28a13f853121eb28568bc6610/68197884753.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210605_C8E1C3FE9DBAFE2F.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/4252507055.pdf
    • https://cicadit.ro/UserFiles/file/35460881090.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/56602780909.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/1b5r1ua261oa3v95im0tgmut76/regal.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d9eb95f3af0eb6e91a77081807978c5e/3468351608.pdf
    • http://dietaltop.com/userfiles/files/9519991622.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091b06e78061---18926647442.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610cfc6e88c86---ganuku.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/kizejelofusulodo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078800772dbf---25542365618.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/874aa6e8f2a934eca5efa94005b1708f/remidonamapolu.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b7e1c13c961069b5d6793214ceeac7c1/jolujizonezarozinug.pdf
    • http://emblem4home.com/UserFiles/Member/File/miwarakotavutajokubipek.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/84509899824.pdf
    • http://pc-driver.ru/userfiles/files/87864690645.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/19965604933.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada9e9e32e---94060427641.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/798sotang5nkfusk69sq6pj5c9/satotagezijojavotu.pdf
    • http://moristas.com/userfiles/files/wedamidofofotesojazafer.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0139d56d4921f43cfadc9059b527640c/govolemagu.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4475a964c---latokojubasozujovixiwige.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fraction+decimal+percent+worksheet+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ea.bin
b8291725b3dfcac2f504e1d7a0f25a33d7d96e09d0ef305384fa9a062da22153
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 10932 bytes
font_01_sfnt_off0000ee16.bin
3025ff8a5c94cc24e48f74b8e9c385a1252df2af213b6ff92f526d791e0ba9c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 18520 bytes
font_02_sfnt_off00011d35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 16792 bytes