Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f787c232ce44d4…

MALICIOUS

PDF

105.0 KB Created: 2021-06-26 19:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09ff78735e7f9385cb5c40aed7d529ba SHA-1: 95400fe8f0f19472084e4b3023f1c79dd90742ea SHA-256: c8f787c232ce44d4002ec5f76e157e2c194bdcf6f87f5ac01ca723d28eac8d14
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/af4d352990ccae20682963f5d352fc64/rasikolewanewujaruratefi.pdf
    • http://matsonconstruction.net/userfiles/file/82113553631.pdf
    • http://hugslock.com/app/webroot/img/files/9878097572.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f3b7c0d0f---dipupiwaluvilumakabutufo.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebcf85552---jigulisezixoguradiziduz.pdf
    • https://aviseco.ro/userfiles/file/bubitufovabujupuwijuzet.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4a221be03fe62e1a0b9625d50c415d5e/tiromabulam.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rtsijjuakf22f7denjbb4dk974/tujawikux.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/96711933006cfed9cbd57e4357fb0f24/91279231727.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e0fc9e393dfb9e6c2eb46936c47513af/ridijafusosoxonus.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad01fc0775a---wajobatuxudukima.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/vatumube.pdf
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/61856299305.pdf
    • http://www.aluvascientific.com/UserFiles/file/mofeduw.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/afe25ea20f02f782c1bee31bbc2583e1/denadekid.pdf
    • http://eszixv.hu/ckfinder/userfiles/files/9062346235.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/e2s9ugsg1sds58kibbpsrtdf2e/vijafelegute.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/80555205640.pdf
    • http://komputerzagrosze.pl/userfiles/file/nesudilovebidosef.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3321a61cc6798d4c5c1eade23555c375/35732156532.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/75f62bb9de0d305e5894ab19aefee3ff/vowijosofenomebo.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609368b7a4c7c---89805029647.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=foreign+breed+of+cow
    • 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_off00013c01.bin
8bb90c823dc6cc34badb172581a71d00040f67317003a8b0898a6fd4827e7b39
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 16780 bytes
font_01_sfnt_off000167ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x167AE 16792 bytes
font_02_sfnt_off00017fc5.bin
df50982cf167fdbfff9d2138ba678b65b96801ec8bc35e1dd8610cff01b4533a
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC5 10380 bytes