Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e90303b17aefbb…

MALICIOUS

PDF

94.4 KB Created: 2021-07-05 02:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6df3fe5fd07d1b4bac28c828f97f3157 SHA-1: c314772000032ff0719878067b3de2972507cccd SHA-256: a4e90303b17aefbb85720a6c1c7b0a70a4354f2e989532310b448b1bdd7a2c53
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://acecaalcoy.com/userfiles/file/saxesimitanenipatage.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6a8ad780---biletumivakatudi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092389e0b2d8---66595559117.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/gunapi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/goboxuluneliz.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/fewawonapapebivejepubi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/50915b6a9c9920772d6b654c384d6639/14946262797.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n1tvdd301nih572157tvbnj9cf/vuripatanuresutefepitu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vt0amb7l1l8v23dl4j2uiea2c3/bubisejepajagenejefin.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9d372229---22198930667.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/8554677945.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ca0d493732ae72c69bcea5a0ccebad72/pivitogilemokevuxoxon.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/sqv1esba1oq9fog7aagejnda73/fosofesubaneduzi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f689b2e4ba---87025123287.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/49001732660.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/40263390309.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d3edbdb926c---nuvezozonoxenuloraj.pdfIn PDF document text
    • http://servmed.net/userfiles/file/34385506816.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/xosijereligijazafugaz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e0f1e078f---27094816147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=plato%27s+story+of+the+ring+of+gygesPDF 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_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 16912 bytes
SHA-256: 3d74dc002d4d19e27f16ed8a0c8f22c2a6835506a300e199291117e0b91c4988
font_01_sfnt_off00013a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7F 10640 bytes
SHA-256: 61fdee522dde5f62cf8833efe318efc3fa27738c28d653083af6b931d0fe9576
font_02_sfnt_off000152eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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