Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6051a6f963c5fd4…

MALICIOUS

PDF

94.4 KB Created: 2021-07-13 01:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afd2bd176daea91e01002c149d07d3c8 SHA-1: 66f91cc7be647757ed3b74bc46904efdeb76a031 SHA-256: b6051a6f963c5fd4e45ea0923e28c948db2f839c48af90b343ed1245f95b53bd
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. Numerous embedded links point to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution attempt. The document body is unreadable, but the presence of many external URIs suggests the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57010366d0---4331548440.pdf
    • https://alajuusa.ee/media/contents/file/depezaxabelazobipefidaka.pdf
    • http://cissi.it/userfiles/files/sawudavozuz.pdf
    • https://edubox.mn/uploads/users/0/files/69484584539.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/3967923734.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfce3dd778---bunupofe.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cc9ed1a65a6c3d806264e67d3324eeee/vodek.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086413a1d774---30435787617.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c107e1767a3---jusiwoxikovavot.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/72803184574.pdf
    • http://bclgrouptt.com/userfiles/file/86527965914.pdf
    • https://soechi.net/userfiles/file/rozos.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/jfhqoiaie7m1tkfqnfvfeuevgi/40139496156.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f900a730789b04f2428689f50f08ce64/95359651506.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160883a0456013---15822824085.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9e1270ad---rudakozudasam.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0e42d76a---69650322849.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/i3egpfiecsst8nc614lev845gq/71593964224.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609288d036a7d---44034152053.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/83ad2161ab985222f14ce2a9138e549b/83772905020.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f954c1795---sarozini.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe48cd3b2---73105418582.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2974ba57e95d953eb5e27249f103d6d8/91473898631.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16095cede0f84c---worifizegonex.pdf
    • https://songhong.info/userfiles/file/68349200437.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=production+possibilities+frontier+worksheet
    • 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_off00010eed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16792 bytes
font_01_sfnt_off000126ff.bin
d3e153b6af61f362f1f0ca6dce2997325b4338b98523c8f8dd451621ad20cfb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 16284 bytes
font_02_sfnt_off000150e4.bin
811215c008667443b9b75abbabde4326294e1cf36c0af3f7d7b3e8e503c70709
pdf-font-stream PDF embedded font (sfnt) at offset 0x150E4 10976 bytes