Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be993c9cb16b5c0…

MALICIOUS

PDF

89.7 KB Created: 2021-08-23 09:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57b129efebde628b4dac81bf9bb8a37d SHA-1: 9a0997ca2627524bb056a54f2cf630860adc88d9 SHA-256: 9be993c9cb16b5c0e729dacd5a342d4ad36d125a746cdee2a13a31fcf9e1127a
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. The presence of embedded JavaScript and numerous links to potentially compromised WordPress sites suggests an attempt to lure users into providing sensitive information, such as one-time codes or MFA approvals, consistent with credential harvesting. The document's structure and embedded links indicate it is part of a phishing campaign designed to steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hidra.it/ckfinder/userfiles/files/33148940027.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/wugubefemuwamodefopiwikan.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39ab7bd80---82949889659.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/tabezofetiposarofofo.pdf
    • http://ouhkpthaa.org/userfiles/73187386402.pdf
    • http://w3-japan.com/js/upload/files/77539552948.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077461646002---widumisivefawowon.pdf
    • http://muntepa.com/userfiles/files/tuzadetarezeger.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68e14c4fa---16154124218.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7e7fbe30b5c6015a44f51086db17e99d/zalom.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072322b30099---buboxapizuk.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/9227055349.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dae2a142d0---34268711312.pdf
    • http://billsky.ee/files/file/tujesasoluradatope.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0oe3mucg3if68hco7etq1t7581/zogoviwuboneza.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/61788f08ed5034e75c74e0717cf260f4/jajimipopor.pdf
    • https://bititechnika.com/uploads/file/vafilavekusud.pdf
    • http://hangtatmj.com/userfiles/botanemubamonax.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161124e7321454---12378827878.pdf
    • http://hanilkwanla.com/uploads/files/77401907156.pdf
    • http://www.amedna.com/userfiles/files/35206685524.pdf
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/ditemusisegegoguruw.pdf
    • http://kirilmazbardak.com/userfiles/file/dojoweju.pdf
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/jepebawusotubifovorep.pdf
    • http://ecohort.com/userfiles/files/54786922439.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096057a568fb---71719724032.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fake+indian+number+sms
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 16792 bytes
font_01_sfnt_off0000f797.bin
99aa9684941611ace28051ac58d2909637b469ba85cb7fbe87dbc71903a7d5f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 17528 bytes
font_02_sfnt_off0001257e.bin
f9a068621b4d6948c10f61bd2f78b72571189e840f5d85fbc248b3da11be1723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 8520 bytes
font_03_sfnt_off00014164.bin
135478c5f9a3a19558f0f3170c54b13fbe8b95b4f052749b58b872bb291ad077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14164 10456 bytes

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