Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56076528e169f26…

MALICIOUS

PDF

76.2 KB Created: 2021-06-13 16:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1c9e414d1c583ff28178489824cafe12 SHA-1: 5b13182966f8f7b92c6c5d0ab15a037daabbc90f SHA-256: f56076528e169f26892b89c1f52825e5b668c6bd0f174cf4929e9c9ffc5a5886
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=deadtoonsindia+pokemon+season+23 PDF link annotation
    • http://syuncyoku.jp/upload/file/lipepiwitudafidujamix.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e2826fab5c72c4f6bacadebcb2aa7608/sosakuvigipinisavesifudog.pdfIn PDF document text
    • https://activepymes.com/pub/file/55012477769.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f31255d384532111aa2af138159e7314/27565366627.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d9e47a7b494992b906c7fa2273c39010/87206181411.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/86973637042.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/84122000135.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/301904469847.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/58faf6c49efc608183ed47574b82000d/60310511967.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4fe9bad9---logovapimopowopiwa.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/xejokepuzizakimom.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/sivugow.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bfc35df9322c52957dd93462b81f0d23/57074911012.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9637bebb---89295611895.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a665d5396---sojorigafapiliki.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d6c4a92c---nigigovozokegavu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 2988 bytes
SHA-256: 507d5095653cb1d73ea84cdb489180aaa5bd95d7add5ee11c00d56e8a6e2af51
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 5336 bytes
SHA-256: 7dfbd477cbc97c0e8413643b0bc2d711bfff947fcb1f55895bc152a2600b829c
font_02_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 12080 bytes
SHA-256: 4fd15580a79a5d6b31577af369d0114cf7ea4c6a6286deff5b27f3e96e47685d

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