Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38a79381e4d5466…

MALICIOUS

PDF

99.6 KB Created: 2021-09-23 20:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4e849171b065daa48bf64157ee8288a SHA-1: bc5ae6492dfc492d852dae34785827b6192930d2 SHA-256: d38a79381e4d54665f898c7519d15018b43deb59dd8f12c9b28684c12c3ba116
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URI links and compromised CMS upload links indicates a likely attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ibookingkr.com/FileData/ckfinder/files/20210906_A05C592B6560EED9.pdf
    • http://luckdidea.com/ckfinder/images_store/files/28462993070.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0525pcd2vm97vc9777ensjc3uh/gafesozijixumewuv.pdf
    • https://mehregancenter.ir/images/upload/files/nifaraxudilujojowake.pdf
    • http://sllight.ru/design/img/upload/file/94704364263.pdf
    • http://2sisaccount.com/userfiles/files/31080451226.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459879a9894---54928029691.pdf
    • http://nissanotogovap.net/uploads/images/files/gapokofonanebupig.pdf
    • http://atrsara.ir/resource/files/60009449466.pdf
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/65713137732.pdf
    • http://ji-tien.com/userfiles/file/27033147821.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee10478b76---mexigimebegu.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/3158475294.pdf
    • http://geologicatoscana.eu/userfiles/files/37934927489.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/cc318cdc55746f797e7a0f004c0c6200/nexavibipofes.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/17626997951.pdf
    • http://888chji.com/userfiles/files/48263492699.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161423aab153cd---rubizeteti.pdf
    • http://vanhacollection.com/images/files/pojavosezepizetenasak.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/tivubusab.pdf
    • http://fmi.lu/userfiles/files/45962888162.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/33633748135.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bhagavad+gita+english+translation+pdf
    • 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_off00011abd.bin
ea310bf423389b813b6ba889111c428d815a7c5181327b23b8e281cc948afb48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 20168 bytes
font_01_sfnt_off00014f64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F64 16792 bytes
font_02_sfnt_off0001677b.bin
3c3fd6c3119902977456c811f998cce265f40ce06db18dcf5c9ddb2dbda5f0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1677B 10896 bytes

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