Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd88e818c4f35a6…

MALICIOUS

PDF

89.1 KB Created: 2021-08-16 20:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c1fcedb26863424dc05a7fbbbc3003e SHA-1: 2e06c17f274f9fc5a266423b673210c113de089f SHA-256: abd88e818c4f35a6accea8836d54b747d1561cb6ee9f5170c091316e493791bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a redirector to malicious or phishing content. The presence of external URIs and link farms on disposable hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=apprendre+alphabet+russe+pdf PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ee54f0dc9---9913793509.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/94re1eisvr6t597lc0gilgltap/29242486537.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e7357ee4---sidafevew.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da17401362---11356710932.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eidde6jamenmh0kdigseq1umj4/66276855006.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6019212f9---xidepati.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2294813fc2---jewuriruwodimerililoge.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160add37cdfb4e---pafilubesekaworukif.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/19180507547.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e5ebf8dc---17232613922.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/zevojulolef.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b90757ea---94765779601.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72a6d289a---rugixaguremujoxuvebop.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/regaporazureluva.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/71021935624.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/xakejuvogomodogusesunuj.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/zixegebeludekamoraliwaw.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/2845a32d819a8d3cb293e01155b175d9/lezomofobul.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/wigopotugarurutibalokoli.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/32939743495.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/68494269593.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/71371206757.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4a56bc16fc20e77b9537163d8fe2593c/97805299627.pdfIn PDF document text
    • http://superpart.com/files/29795454548.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_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 25496 bytes
SHA-256: 8ba2bc1daad60f3426c23d0483828938796d7e8f430f5f6ee03199f956534cff
font_01_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF5 10604 bytes
SHA-256: 7826dff300f411c0386381613f68dcbe94717f9aed257c0e891a7e3a808c0a5d

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