Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce594d087754a4ad…

MALICIOUS

PDF

75.5 KB Created: 2021-07-04 03:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d9dfa8d14ca7dfa0835f6bcc7281576 SHA-1: cae66f219bfc0ce1969a7f2a2d36d544f899aea4 SHA-256: ce594d087754a4ada30bd889777f9411ad2b97ee0ceabfa0ae76ca2b18f19e91
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://monkey-do.net/userfiles/file/82384393166.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2d15ocip35raebe27rs9fe08pv/30329367570.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kgq0ekalas24365h30b0k58ac0/tazituba.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160748a79f22e6---93019526791.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/drfpr6hhb94i27m1ekod4oji65/jejemivitezuna.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3343dc06e---5237018265.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/88909303701.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a050e47ad97e7dd610b5dc23c0a6d00b/91556123740.pdf
    • https://diedacorporation.net/freesiafiles/file/xebijarijukugiwaxobonipif.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/988a57a95ccd55f4cb913c13e42350cc/retegamujobipe.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/542e849042850af20571a88341bbdc45/siromodafojulazeduf.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/42ol4q2r7qb8tqd03brj0khvho/26673577542.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/zivas.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e8a363c9a---75229931896.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6068b013b6f0bb08f58823eadb7eae97/31685807003.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/51019266936.pdf
    • http://shuswapladystriders.ca/userfiles/file/logurepapogodikipukiwofoj.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d1e8c5c5---sesejutubo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160949e340a979---43937685657.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b576a0fa8---wijagigimikevexugasumavan.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e9ega00qu3i3ijv9n3tmoem1t5/45767734068.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/4homlq6209egpisaq5tkbcl1c2/36758248215.pdf
    • https://vicotelecom.vn/static/source/images/file/91904394453.pdf
    • http://ckpak.com/fckeditor/userfiles/file/36650951496.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc3d64760---54714351024.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+core+electrons
    • 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_off0000c6bb.bin
933e0e0ec8b879a53705ffea62fbf6cd3aa25c26cc07b894e14543b6ccb0409c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 16668 bytes
font_01_sfnt_off0000f1ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16792 bytes
font_02_sfnt_off00010a06.bin
b3112130ac58af6b749db697e3f6ee54f10b0864363b3ce48c0484310bc3907b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 10228 bytes

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