Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd23178014cb8ec0…

MALICIOUS

PDF

76.1 KB Created: 2021-06-29 20:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35ba8082d5bfd08074319a113891b839 SHA-1: 272ebd5c946a3586123fb1f15052c9b810b7c754 SHA-256: cd23178014cb8ec0b234397dd3b344081ba62b6aedcd53033600c23010635848
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This structure is characteristic of a link farm designed to obscure the ultimate destination or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2f0ceede---pevedefujek.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7d181f01---saxozevujewojap.pdf
    • http://premium-h.info/files/files/90702600415.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/71bbef8716bff7d9170964c1d0e64b85/29703153491.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacd8eae86---zibasuximu.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ak9og438pftfiip6prd9kprp2b/nuvewepariwimetitovu.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e27b11ceb---kusagoles.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba9232304a---28064580750.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b4a1409m94db3e7bct9q12nud1/divepiwogaburo.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6h9rhl1eijbbpirpmq4ks90ln6/73756806381.pdf
    • http://alnadaoil.com/userfiles/file/nitome.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5eceecbc6b1bb0574a38c55ac4eed71a/nufumepefap.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899d284d427---45940666362.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b2ab2de701cbd64fe53bc8f97a78e833/tonisejiko.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ca7bee06---gesebitomutilora.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa1063a13---zojubugixukasidoxuni.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lfrkd25fg0jvef6rok5enuf0f7/vuviw.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0ff2f2dc---vewotadafuxupudilanil.pdf
    • http://meble-tk.pl/userfiles/file/tatotok.pdf
    • https://peterdegendt.be/file/janosolizibidotajurape.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8f3a4a49---vowubikuzowokezibegirofev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chicken+charlie%27s+table
    • 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_off0000c8ff.bin
6724aa009ad1a830636883664554e589bd1bde2d8255547f279cbb8aae97436a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 10504 bytes
font_01_sfnt_off0000e0eb.bin
27a7e3c44c3f923049ce7fc23f26035531eb6b7dc8a11c1bc6b0cb142c23f573
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 16364 bytes
font_02_sfnt_off00010b4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16792 bytes