Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b7d131dbaee0f3…

MALICIOUS

PDF

153.2 KB Created: 2021-06-18 22:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0850082d15c189f4cd1e742d8443642a SHA-1: 9a4eaf4a125ec634953e3a05b8186a9097c5a49d SHA-256: 42b7d131dbaee0f3d6305229b87cdf0e818df4dc65e0fedd24704b481d446f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f2a613ee0---94973183408.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51e95cb80---61483447073.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed2e2f451---14114269926.pdf
    • https://amatnieks.com/pictures/image/83153037145.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/mojomikebesiju.pdf
    • https://acgroupenterprise.com/userfiles/file/60030822732.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094089e93606---tetiwiraribeba.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd0b682e2---datimusijaxoxo.pdf
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/25059244850.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/72a4068f9063da3d552f61208ca2c47f/fisupukukowineneriboxu.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/gatibatovodesabezid.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d5fcd0a2a---fegofozezuketiran.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/99ba2d532ffecb2096dcc52ec0cc79b3/85204298819.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/h1lb6bpkb52ti3lq7sm4kj2j8j/ganaxipuroje.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a171f0e3877ae1106034681728d086e9/8728916223.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/68039ce4d76706eefa70bf30dcd12d32/70702904694.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+beatles+solo+album
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021f9e.bin
a2dbd26d14da305801c02fa3ae51004cd44d4dc346803e9568e107fbeab9cff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21F9E 4924 bytes
font_01_sfnt_off0002304d.bin
3a73c69973281fa23859b94651d0487f7b53d6828f7561ad99f8e292bc9da7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2304D 12076 bytes

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