Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c021e55b94ef29…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 09:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1168fbfe13cd5c16be081f675adb82f SHA-1: 1b102acfad80dbd89f71ae5776c7c70e754520d6 SHA-256: a6c021e55b94ef2949556fa7b8733d4d8cde685885b2754f1cc654a5b6dcfa80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://noithathoaphat11.com/upload/files/lufozejozawujavud.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47902014470.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b81e648e6---vazukafewitawesij.pdf
    • http://wittlich-luexem.de/userfiles/file/35867380376.pdf
    • http://grupposcorcia.it/userfiles/files/46710870686.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/446053f50d6a7b1004d6dcb3e99ee1b1/7619014345.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/rokejapi.pdf
    • http://skupka54.ru/upload/m/redifotoludawid.pdf
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/43968072412.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ic5jc8omotmd5toksnceatogg3/78436101505.pdf
    • https://receptabc.hu/images_banner/files/sokepuwexitozese.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/65109802864.pdf
    • http://evevoyance.fr/adh/.-/file/jatulovijalutuga.pdf
    • http://minipit.com/data/files/talugunigevekovoma.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/patotijovuporitulegiviz.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/72754630961.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/d84d01ec021511df1101b5536d20cce9/17284301761.pdf
    • http://sabancilojistik.com/userfiles/file/9205817981.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/9941744995.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/otsh0aao3u4qmopu8c8arleape/43312177747.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/on33149asvl0c9p20u6tutu6b1/kogumef.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3i6bcckgh6apu3hsk154gbpbi4/63687527284.pdf
    • https://olamare.com/img/uploaded/file/55268327792.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=aoac+methods+food+analysis+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_off0000c2e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E1 16792 bytes
font_01_sfnt_off0000daf8.bin
aeff705c7cb933d6e6c66a697f7781e8defe71eed6ba7fbb452f8146c7fa2f9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 10880 bytes
font_02_sfnt_off0000f400.bin
97af612a3ffdcc8a8ee6367e9ab52a06e911eb2417a0407ae904db78f8ccbb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 16616 bytes