Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a65ad54b882067…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 10:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fda6ad6661ceb5187e22c73cbb4755e SHA-1: b9c782c9ecc8928b4b9482627463d4eeb3764f83 SHA-256: 70a65ad54b8820673998c00b5ea2cf107d170f7c279eb02660778597a324bad2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and contains no readable text, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://iburgisidimarsala.eu/userfiles/files/pogapogupabotanotezosofum.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/tibabopip.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/mnbn8d3k2gbcvrn6nlt5f6pb9b/koradibizux.pdf
    • http://kielcenoca.pl/files/file/fugezizomirimimugifasove.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb2788946---midigikodotimozepiv.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/filimonixenevujanuzu.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/verajur.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d82fb19b3c---vujibetisuwodorakelit.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/86027424589.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/04e4ca2277106f03f00cd0cec13a71a0/revaxomojiwegu.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e5557152db5ad9ccc682baaad6fcddf5/tidexawafux.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16096a75834098---fanaruguk.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5ubecfmr4j6jqhl8f1o8qp6gfj/sejirasizozupukevuxeke.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/detakisitafuwovadiwa.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/47422b11942386ac7a2495af02fb471e/dodabur.pdf
    • http://griesvoegwerken.nl/UserFiles/file/jeveje.pdf
    • http://candientuvibra.com/images/file/71315446399.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f888fc39e9---34071342753.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ec76caa9f---wibabukazitit.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dnhg5m5f1veqvbj8marupukeq7/13543651927.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c127ed976b7---fazofatewova.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=arrow+pt50+pneumatic+staple+gun+manual
    • 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_off0000dd00.bin
ab78634f23e6354061d3bb5bf9371d97cdb16d4e0bbaf5a6efa4c3080911604f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 17444 bytes
font_01_sfnt_off000109bd.bin
cf07deea9524e371adfaef3ef97142bb0bf8bb1d3a2be177012298b95ce66f6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 11140 bytes
font_02_sfnt_off000123e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 16792 bytes