Malicious PDF — malware analysis report

Static analysis result for SHA-256 672c587d7334070b…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 01:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d921a16aeffd33efa987ec48fb0f9d96 SHA-1: 848ca90d1a79d4fbee9d71300954815a04b63085 SHA-256: 672c587d7334070b60f32b7eb0651b5f6b246679098f7eb2c4ee52fe0b5bffc4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://chcial.ru/uplcv?utm_term=gs+score+topic+wise+syllabus
    • http://pro-group.ru/userfiles/files/612420486.pdf
    • http://akicgiyim.com/userfiles/file/xagigivomilalasapewilam.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0c974687c---23369313747.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18bd4dc5b4---nulumetinaf.pdf
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/1bd6aj2302ue5k26g8crehd7f5/pikarefijoxolavujelexo.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vg6hmp7qfo1ailjaqvmaeoaa5s/retolenuleralirulu.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d291fa6421---33495628414.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/fipogenawumajitifaxuvezo.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16070b899a14b1---18639249592.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/llqs99v9luakeq8m5ddhhco446/37735083934.pdf
    • http://geologicatoscana.eu/userfiles/files/72169863195.pdf
    • http://snap-drone.com/userfiles/file/64234688816.pdf
    • https://najarshi.com/basefile/najarshicom/files/xevavumojoriko.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff971b1f9---pusosilegizagotoj.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pa0k87mn80gng1sg2ad3csibk1/rofil.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab6953951b---5102104653.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cd585e9f9320cd54989a38742e72a22c/kegugavazasu.pdf
    • http://goldnumber.info/userfiles/file/69651912126.pdf
    • http://www.tobywells.org/media/fckdir/file/dabelomejun.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b518b3122df57f0eec8bedb4589fb084/mizibajusuxokatexotij.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1291ffc9---29793672372.pdf
    • http://provia-events.de/pics/fotos/1/file/dipufipomowufuzed.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/uaqputl277dkjj35iit3adfcm3/85198468411.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5a7530b9---zarevomaxidijewaporemu.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f993cdc44fd50c2af62393b3729d31ee/nogosixokexizemovuzuze.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d8d356bef6f7e35551eb08fc5bd10612/33619534362.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_off0000ecb9.bin
a3e4522ce082b7365e3cbc3b2a930d365a257608a69815bfa8bf1df2dfc8d002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 10740 bytes
font_01_sfnt_off00010575.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16792 bytes
font_02_sfnt_off00011d87.bin
8bf4359ea2a8f23aa2635778eb4de53147c4dc41d12f1a1ab66099d978483504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 17100 bytes

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