Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0285f63aa3d473…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 22:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c65344b47c423b90f48ccc8c54d98a38 SHA-1: e63b3edd703aaba0c6a4c6a443e7918aea683e33 SHA-256: ef0285f63aa3d47370028c2070efb28313c09bb2c05b70413074d2079d0d7cca
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous distinct hosts and links indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612396c1819e9---8099179266.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25bb170083---64639204485.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071a561e9651---meposa.pdf
    • https://air-separation-supplier.com/d/files/14739773383.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/078ffe8673cb48966205db49ef6fbd61/bozalazawekek.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gdbub4ncn920avdf6rgeae1nr6/sabinuwe.pdf
    • http://tsrmmessina.it/userfiles/files/sonokokopasofujoganidixe.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/topozoguzif.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e5737f1da8ca3460f78168ad1594ecad/38009085788.pdf
    • https://bruceleevideos.org/images/file/debokixozedivenijid.pdf
    • https://ymvii.com/admin/upload/files/3091027179.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/fa6a613a5b9820c27f3a814d29d3f895/88833796321.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e979752a4c---42838237242.pdf
    • https://clove7.com/userfiles/file/ginuserezolinoxoka.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnpt9nedeujosdgbp6opubjcfe/bizidepetatodokarir.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfa848069---33205044024.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kmfst7jmga13icvva273s56q95/jagowinamoxugolo.pdf
    • http://xn--om2b25zm6igqb.com/ckupload/files/pibagufanepujijuzajufaris.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/9f27a0d7987914dc11df36ab3a270244/gopesoweduw.pdf
    • http://altelaw.com/uploads/image/file/40961875785.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=list+of+all+percy+jackson+books
    • 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_off0000cf1d.bin
25b3f7f86bde3f68ec65d07dd226adb93542cbd53a015aab1d2617729b21ad59
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 16224 bytes
font_01_sfnt_off0000f919.bin
82e85a94f8e512da12c111de104cdf74bad1048a92c822ca21c8632b96a9c023
pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10904 bytes
font_02_sfnt_off00011244.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 16792 bytes