Malicious PDF — malware analysis report

Static analysis result for SHA-256 187b5b9a29319201…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 10:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf04a61daf2fc516b5555a3af78586f5 SHA-1: 75b9820095fd104b1fee7fda6651dcc184cec285 SHA-256: 187b5b9a29319201ef74f23e5b00bce6ad2dcd0c527a6f4e2ff47186f642af4e
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 CMS upload directories, 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. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd8a3ad25d---85859805861.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2634678dc87df38226a4b4ad52c87a24/99627777673.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161415425e9c80---fujaza.pdf
    • http://gkz-crimea.ru/userfiles/file/gewub.pdf
    • http://saraiaser.nl/userfiles/file/wozusivilavuxorujijasiwa.pdf
    • http://asacnfservices.com/ckfinder/userfiles/files/zirugisozakemuw.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/58552849375.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/fuvajirizere.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/puraguwiri.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376f949449c---tiketudawedepufaduxoxiw.pdf
    • https://patriciogaete.com/upload/file/kexebaw.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/61471666852.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b2ecfda63800824f209a8c0321807fff/30507654387.pdf
    • https://vetregistr.com/ckfinder/userfiles/files/90740545438.pdf
    • http://naszemotyle.natura2000.pl/imgturysta/files/87984745774.pdf
    • http://textstricker.de/benutzerdateien/82118915678.pdf
    • https://mwasafat.com/uploads/files/31756741341.pdf
    • http://beamstraffic.ae/amb/userfiles/file/59500315286.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/43389430148.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/66518556873.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0c698d9e9---72198885876.pdf
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/32576606873.pdf
    • http://dambi.pl/userfiles/file/tefirigarunesetovofez.pdf
    • https://rugsinc.in/UserFiles/files/23609077800.pdf
    • http://faradbox.pl/files/file/56658971118.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=flight+game+free
    • 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_off0000b642.bin
cd9a243c8ddb194f30c23292eb1b960b51d83ce8a3c5a912ec8ba06e923f18ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 15868 bytes
font_01_sfnt_off0000de51.bin
0fc9db0d8028e48be7d09ebd4fb59dc341a95a7115195aa1a1320db77f8b55d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 10244 bytes
font_02_sfnt_off0000f542.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 16792 bytes