Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ad803f30bb7b82…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 02:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 564b929b9fbcfe71ea76ae10dbb67946 SHA-1: f4e2ac5c68aaf77c0bfbb49e5f6e33d6320e3957 SHA-256: 43ad803f30bb7b828ccff8d08460205deedfbd5b8c3130887909f5d760515256
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

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 http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43694332495.pdf
    • https://soechi.id/userfiles/file/53650281710.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/21790699105.pdf
    • https://cesiedizioni.com/userfiles/file/71043128972.pdf
    • http://tourister.kr/userfiles/file/24609811533.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/46df6b68fda6dea8c8b0c05ed01f97bb/65104178427.pdf
    • https://fetogram.com/images/upload/files/duzidod.pdf
    • https://samuelben-horin.com/userfiles/file/89659820687.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b262274b077---viwurojojoxubumofati.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/63806951936.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9b2307afb64f2335a3a8500dd47f59f2/45349155565.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/44769361138.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3dd3dl0ncprtpr89q4o2od7jjv/68232194144.pdf
    • http://ebrinteractive.com/userfiles/file/54482908265.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f41fa9649---xadugepukapogeripisunafas.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/5651573304d02868969b3c03944c450d/59026261932.pdf
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/baguvoxepaviwomanakukibo.pdf
    • http://alhs1973.com/clients/64426/File/55391170595.pdf
    • https://hockeymro.ca/docs/file/naboxaj.pdf
    • http://jp-cable.com/d/files/xibejakezoxinaluxe.pdf
    • http://palirna-frydek.cz/uploaded/file/gikuwezovazibilexaz.pdf
    • https://sayurhijau.com/contents//files/63336349182.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6af3a23472e43b7bdeb83860e48474ea/71178447499.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/xabuviweliwi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=life+in+christ+church
    • 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_off0000b585.bin
8e26f78db1e56fd2f895a7205c83fe47662d156b10f31544820ca0fce8443e0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 14320 bytes
font_01_sfnt_off0000d8e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 16792 bytes
font_02_sfnt_off0000f0fc.bin
fba6d799e8c1d1a0b1624ac0b8a5edd38086c62ffdf4e94c5239d4ff90093e19
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 10160 bytes