Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afdc0c9cd8a4998…

MALICIOUS

PDF

95.0 KB Created: 2021-07-22 04:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7adae06906d4ca24372c85b1fe3f6c82 SHA-1: 8fe0c6f203821088f21a933b0ab0ca7d9edc5e8c SHA-256: 9afdc0c9cd8a49982d47ec80af6bb8995870b54756b0ad5b85729dc39ba2865c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable domains. The primary purpose seems to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nelly-design.ru/upload/files/71606829820.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160767f96425a8---97320069372.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/11887576897.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c734d6b776---22647904054.pdf
    • http://verduciautodemolizioni.it/userfiles/file/66149934722.pdf
    • http://unipsyclinic.com/userfiles/file/20210607014408.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4b74454441b18a2f2564574fb50fc1de/12812636766.pdf
    • http://skrabl.pl/www/rpbd/fck/file/sikefopilafiselomona.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/pexedigekiwanijisaka.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165cc61d68---kekanapof.pdf
    • http://kleinschaden.expert/userfiles/file/19283133993.pdf
    • http://archimax.ch/dynamic-images/cms/file/raxunejazepipunet.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee3acec0d---sasug.pdf
    • https://shopabrang.com/images/files/lerezilerivuxufuwilofotag.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91dbb17f8---safad.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1fa5b9ba4---tusalatenizaxeduvadonoli.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5abc59da1907edc11b5a94c2d4f75126/vigovekizirap.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kp25kijhrcua0089m4foc18l5e/zuwarunaduzepeko.pdf
    • http://ncabhsa.com/clients/875427/File/503951046.pdf
    • http://garmagostaran.com/Upload/file/88273425683.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/vazivirodazem.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098260ae06e8---70785678333.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/getuxapogikew.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc0446d04---wabebobofu.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49adeb5229---tajedazoxagefadewo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=famous+opening+statements
    • 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_off00011034.bin
9777bb1ba7c6a4e416e11f23bba9d02dc863980b0c0d17769b0b031f397c689e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 17492 bytes
font_01_sfnt_off00013def.bin
e58a38f2e1791fb1ace47c39ac75eaa15136051b427254bbbf16510722d0e2b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 10528 bytes
font_02_sfnt_off000155eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155EB 16792 bytes