Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aa6a54017d607a…

MALICIOUS

PDF

83.3 KB Created: 2021-08-29 03:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d461e649002054a14c944d0b337b1d5 SHA-1: b7b98a2e4bfe92bbc0dd9ce728ec0215106475b1 SHA-256: d3aa6a54017d607a75729ca7eb268a4b73f3deb5425f58d86e307764efa64e05
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be SEO manipulation or distributing secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://mazurubezpieczenia.pl/zdjecia/fck/file/nututezareviraputolufafo.pdf In PDF document text
    • http://labonscafe.com/userfiles/2572119879.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/40761130050.pdfIn PDF document text
    • http://kgmda.com/upload/files/84611997584.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/56240708401.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/q5e4f3o8mu1bv0dti7igkhnav4/xavetulu.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/3130987312.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02d925e8b4---luposevimiwo.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/navifu.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/xaxononinodig.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/13645055918.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/uee2m13v2rqfi7omt0ui9ob49m/retavuramew.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/xofetozatipubusomabun.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/63267513746.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/11e73fd73f8a3d87ab01e8fbd3584e72/15878287030.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bf6c5fa6f---murubenowole.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/fc983502c07b82bd760162c669172907/vetoniwuwibobogolan.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/bizuvosuwonizajeped.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/gipuxukavem.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6e027c84---sibufelikowudi.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/simezaxune.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289962f051---fuxidekafujuseriluja.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1983b386f---zisavutirusoxixi.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/rozinozeve.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210702181205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ford+mustang+2+king+cobra+for+salePDF link annotation
    • 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://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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 17960 bytes
SHA-256: 7c98d6baafd04c4620f73b7301420040d189a6bf23ec75e08979bec70b86ae73
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 11248 bytes
SHA-256: b40887f4f0ad3f8dedc69350bc8544ae425779e1bc1c66568a263dfce0e44f4e

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