Malicious PDF — malware analysis report

Static analysis result for SHA-256 43964641305c3c51…

MALICIOUS

PDF

78.6 KB Created: 2021-05-28 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7de7762fb1200552c5f69b6a7889122f SHA-1: 04965fdb0d6f95bc7985f0cb8fe5307507eeadaa SHA-256: 43964641305c3c51b70d7d4b505fd916a89955062d504d6c4e219859891d0a5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://aqbnb.com/uploadfile/file/85987133217.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef81b4e5f---45892529322.pdf
    • http://quickvideo.nl/userfiles/file/zemonop.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160752dde71239---zepusabokogawapazuwuvuku.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/nftmrdghob3ifg6rfnu99513lu/bawosokibiwoburenitajul.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c3bde75f97514283bf15e83381c23f66/tivuxinix.pdf
    • https://akapacha.com/userfiles/file/90476868960.pdf
    • http://aps-mes.com/files/file/sorogolode.pdf
    • https://cgeminfos.ma/upload/file/dafijutoxiposiwut.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/a6db03ecb5b8b6d5650b5452dd58dfe3/dadusojuwirinotobajexun.pdf
    • http://atut-biuro.com/uploaded/file/21045266068.pdf
    • http://strahovka66.ru/userfiles/file/53753496890.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3877902a3---8605935873.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4ef7670c7935fc7ae75fe71b4d5e9fb1/43564252083.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b897l5kvui1huk9pl9bakmvpk0/xodaroza.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834c7482611---rodabixumunuse.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/58205c8c482a512bba5afb64bb324911/18312315812.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e46095691---xakofu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=phylogeny+of+hypothetical+frogs+answers
    • 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_off0000f4a8.bin
4258b7ee73b13170d6006f3b029468b033c03cdfd6205b194c58896d3a6eb9a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 5472 bytes
font_01_sfnt_off00010763.bin
9c3f10b99463e9f22832752dff608357729feae7703cc7e692275b5275f0e421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 10912 bytes

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