Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb9568a6a8bfcff…

MALICIOUS

PDF

87.5 KB Created: 2021-07-20 23:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 222fa22102cf68fac831306d9234d972 SHA-1: 79b483c965ffe71b685555b4d86da0476e6a4faf SHA-256: cdb9568a6a8bfcff4c5e2a8ee29304776affa168601b32d0569a280f8a64bb5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a link farm designed to obscure the true destination.

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 https://agentcctv.com/userfiles/file/94585632560.pdf
    • http://historia-bfured.hu/userfiles/file/61087466954.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078a393e0c9a---wiwijeb.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c9e1d272b---wiloxedejamoviwudup.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0nh9nii6gffg9bktqfjdmv8u0f/76299645938.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dc0d3ed34---36856708335.pdf
    • http://igabana.com/upfolder/e/files/20210607074709.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738091dce4c---38464746207.pdf
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/rupibufajavulili.pdf
    • http://qiuyutv.com/userfiles/files/20210704014350.pdf
    • http://zuche0551.com/upload/file/wovixususexemodebimik.pdf
    • http://tunesistudio.eu/userfiles/files/12307432406.pdf
    • http://dogable.de/userfiles/file/99000954700.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1at832s0ithhnb8qfdm846c20m/44522183280.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/20586407616.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/47e7e8780ff8119cdfbfc6674c293bb6/65182818166.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f622fab3dc---gefafajutuboreluw.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e993867f---fipugabopelone.pdf
    • https://schmitz.cz/res/file/vilifiridazuk.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed9bacd9c7---nusuduganutaz.pdf
    • http://arunimaflavours.com/userfiles/file/48867315607.pdf
    • http://citywideok.com/clients/75789/File/tifatiduxutaxolifum.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db116bcd761---xekujovukigekegagapili.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=small+blurry+spot+in+center+of+vision
    • 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_off0000f3ad.bin
dcb42a29a6bcdc74397a8a7ca63bf6beafa8104ff9abff7f6c445fd975cbd347
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 11136 bytes
font_01_sfnt_off00010d7a.bin
44a63d29770e7db639764692cd06f3a864c73a9980c7fdfe70639b3a538c8c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 16548 bytes
font_02_sfnt_off00013878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 16792 bytes