Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7072a94cf1c3a5b…

MALICIOUS

PDF

90.2 KB Created: 2021-08-07 17:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 654596255d96e3119ad484d292e45c3a SHA-1: e3f0e0a91507668e0fdde5b10f80aebb306d8bd3 SHA-256: e7072a94cf1c3a5b824e9a80b23a56a87276ca514adb0da76a910f1e5f21fb6f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chickenwild.com/upload/contents/images/images/90571769497.pdf In PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dolomirutizegenowaxogek.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/vaduritogoletaxatut.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afab287e44---91646034598.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59c11e8bf---bunavuzebugugojogunudapuw.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/fawurijivapidimupudadu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079411f7c1b9---wexewibufexalulegotil.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/35539866590.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/97566698221.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/16325440491.pdfIn PDF document text
    • http://accronline.com/userfiles/file/ribixipimenekumaki.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/58054042697.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/lorudi.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49e9eaeed---62808849318.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///puviloziwilabomazusana.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/doraxumorudeja.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f729aa9af1---buxajiwuw.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9188f65bdc3a7194854d0e6b28824f65/xonomoduxavoke.pdfIn PDF document text
    • https://khanikango.in/file/gufobimugovunedujifaloto.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743178311f---sujenufadalo.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/afe02229d3aef17a898f1156952817b7/tilexuliguzu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94c7d5583---kepivarulavasugu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ac3ea104aafa4179c2868a927e4b3a2a/69064419601.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3c2a3351---80410445798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=denver+choppers+springer+front+endPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 10756 bytes
SHA-256: d356f5eabc4da240a519ba0244e59fb17f77000dccf6398d446a766e1b517b28
font_01_sfnt_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA1 17116 bytes
SHA-256: 7b27997a28c6a8e37ce1685d26c13a75a84a21b2081562dfb58e733bb7aa4f65

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