Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e2cd76d317a394…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 02:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c40d1c4857b9ac0c8a6aef155693cc8 SHA-1: f0ca03b0994d8cb928d8ab3c1cc811292daaeb97 SHA-256: 97e2cd76d317a3944737017ad4d68c2d4de058f63d656744781733218166ddf6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate malicious intent through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b39b183a---96465669390.pdf In PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/nanogobesage.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/53100618263.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c86676881---66955792889.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/60dd38d320b5686b457a08e279319d19/87771388452.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609840c5183aa---85645969872.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/13daa5b48cdffff17b7d0509e4e46d4b/bewajav.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/86291176425.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae11499de---joxoxebidovovirifawiz.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/35902709821.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/11626d43e72d58a54b4790749623cd85/16085036442.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a303ed0f85---safuvupuzofozugimafad.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb4f76400---rimed.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/32736160001.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/97962929209.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083817783210---riganedafajifovapudined.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/31187257891.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c61bb16f47d---96769146250.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58047ad43---47699590991.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/92410354174.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6e7karltptqfpemm9sgu89af9j/94123612735.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/7813762003.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/91344055336.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210611_E2330ABC77178B2B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=iyaz+solo+mp3+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AB 21580 bytes
SHA-256: 7b3f9d990cdf228b1f5f119efd381b7ea8917e49fa3464f62b537a2ba2ca4944
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 10512 bytes
SHA-256: c5df81e732096aa5e3377ba4c5841d9b71f79d86781bd3d50fdd2368c99a4f73
font_02_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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