Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8c91df9571d0e3…

MALICIOUS

PDF

83.2 KB Created: 2021-07-02 05:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60cf113b4952837a4a8f9d5259e29dca SHA-1: f5122781551a70b7b19df3bcc5ed90848fb62e21 SHA-256: be8c91df9571d0e3f1443b91ce875206fa44e66e94dcb9fee057919473c99802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a link farm pointing to potentially compromised WordPress sites and disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous URLs, many of which are associated with link farms and potentially compromised content management systems, suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://automotiveenergy.cz/userfiles/file/55829422049.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8e19e015---30603423772.pdf
    • https://drivetripper.com/userfiles2020/files/pebimuxomolozaxikewutad.pdf
    • https://clubesolbra.com/uploads/files/93030953165.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/58ca9024f08a5df1867cdb4e112a2c02/xilumoz.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd91d33de---3455516194.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c3a5d0045b80b74ac42432803c726f46/55332024700.pdf
    • http://auto-spec.ca/fck/file/kukusaziretatavubimi.pdf
    • http://adveotec.com/img/file/nenobawawom.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83adf1283---tunimufipuk.pdf
    • http://aybar-gallery.com/userfiles/files/37353755402.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58e7490131---95264931822.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/67639aa8c00a75b5ce373d7d658716b4/88635726740.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f722276cf7d225f50caff5ac4f3e0ca5/risaj.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c08cd336---75012494782.pdf
    • https://x-software.cz/data/file/bekokapejuxusupu.pdf
    • https://dianthusindustrial.com/resimler/files/52895900439.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f6f7cbd4---bogavoneretesosizib.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d2a54ab9---sokisafefilatarexegiwekag.pdf
    • https://dijitalsanat.link/upload/files/lokumifov.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3db7f2b8a---nabifuzejasomefososorex.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d1e705c292b48048a534efeb678ab449/nulinusolawerad.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4678cca3b84ca5b7ec89b70f01ef6631/zerarowu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c2feec1abba---7665503732.pdf
    • https://epiphanych.com/images/file/67721073873.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=upsc+2020+question+paper+answer+key
    • 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_off0000dc91.bin
75468bf45f6bf6d76c65bed4abe35742d49a1740ed82b828544186bfeef448ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 18980 bytes
font_01_sfnt_off00010cea.bin
affe51c4e16cbddad4d28411dbe7ab6d555189bb3c9a4ce55287734f4c903767
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 11108 bytes
font_02_sfnt_off00012727.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 16792 bytes