Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccffbc3e0756931c…

MALICIOUS

PDF

102.0 KB Created: 2021-06-10 09:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: caf1ab3a212092fe9118402849de9454 SHA-1: 8f2a95d7b151685e1138648d487959679d0f6b55 SHA-256: ccffbc3e0756931ce73a17c9d80358a0e37aa4e82acc0bb48f369c534dc99cae
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a lure for users to download malicious content or visit phishing pages. The presence of external URIs and a link farm on disposable hosting indicates a malicious workflow designed to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=turner+super+sidekick+wiring PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6dd509d22---newive.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3dtap5cutu6v8rkaglcsm7bmc7/61362349694.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc10d937ad---71887152024.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7599eacc---nezufinulufa.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/84020011852.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f62146d3cb902ee2505c287a1ef3747a/47948887037.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/sepokizuxifi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7aa96c934baa43188653fb0e7e70354c/sapakajakakipep.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160982f0976147---nuzemuxu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/81a6bk22u7aa3u0skgcel6ch10/busaxuzafe.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb7a9d974---28530165993.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/cct2epgu1gp098v1lqo080mgp7/zejuvifar.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0af78f82---92620243649.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/debajuxibogibege.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b739ab15298---bupavorokepafunajuguzi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/31524829040.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d49a5abaf98af4fa353938db89db3da4/nisurosabaj.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7df86a114b3334bb4f289308221fca86/dozinalotaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00013d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6E 5104 bytes
SHA-256: 1fa2a50a093623e692cb00fbbf98c4108a288e2c3ec66d372597ce3bbdc4606c
font_01_sfnt_off00014ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF9 11448 bytes
SHA-256: 4816512997e62c9bab921ff9a3738d64d3f2159b17a24694c809c65631b01ded
font_02_sfnt_off00017537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17537 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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