Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab11405f3fec44d…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 00:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ace7206494ba9656d46d4b18add64dce SHA-1: 713893f497d9d14ae5cddad89376e07ff6c0cd46 SHA-256: aab11405f3fec44d963118ae77b7d3163647a32783485d7039f9716bc5f336e9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports the conclusion that this document is designed to redirect users to potentially harmful websites. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=rotate+pdf+file+online+and+save PDF link annotation
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/1itok73on19pphetop2a9ebmsa/mebusaki.pdfIn PDF document text
    • https://arerp.kr/data/file///57413627332.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/64e34c9bbe84f32b9d23a9b5ab2c1c30/jidadorufajuza.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d09df606b3f4e4881ec197859b65e7ba/kudikadojamexuw.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/kexunogaxofez.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/favazofiba.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3fb702ac---tivasapiv.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/navovefegosuxejabibalo.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/57503b54ccdf37ee275b24fa5c6d04b2/wivenagurilegomavubozur.pdfIn PDF document text
    • http://aimic.com/userfiles/file/fufikux.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/dopolugegi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f45050520---nipisevafa.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dc5b5c5dc318bb4a065555c1b1424ac1/fogevakulugusozag.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/84846455558.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609028e74b875---44374940728.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cit8hm05nitqcadqnn1gk7pc81/21342237310.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/llbd4b9pgtqerq86sudi0fe5vv/21666870481.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725bb39e115---40085532825.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/57694369261.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16095212a9a329---lavojujupufasizinomana.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pgb25t95r7e8pct0p4qe9pai8u/bomibigudit.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/55821640394.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609484d2bde6c---fatawib.pdfIn PDF document text
    • http://chinazzjx.com/d/files/xodeweziroxoxixuguruz.pdfIn PDF document text
    • 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_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 17628 bytes
SHA-256: 3cb89eeb2d846bbb30c069d246126f601f4bd40dff8e894c9b4eb683c2ae2c52
font_01_sfnt_off00012842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14059 10500 bytes
SHA-256: 42d84ae832d1cccbaa24dc6d44cf55a344bb9ff7c3ff2e7427d9a2680ac1c043