Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8684432b6b590f6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 17:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95ba41ec1def99c65c2574c871a93780 SHA-1: 72fa25143a25dd476c85e6c1d53221457ad2d8ee SHA-256: f8684432b6b590f6df1bc0eb0f751813f936167a8c4c9da3c327241b586f8f0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised websites, and specifically mentions 'pdf to word editing online' in one of its URLs, suggesting a lure for phishing or malware delivery. The presence of numerous external URIs and a link farm structure points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b2hqmrrmh86h8rg7b94l87dli2/fedifelejanadun.pdf In PDF document text
    • http://staceyasp.com/UserFiles/file/31361497711.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddc131d14---japadakibususatiwidut.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/64623217381.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/kobedudetu.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/jalirerifuxogopojolowen.pdfIn PDF document text
    • http://xfswchem.com/upload/files/86635754292.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/pifizuvafikotuse.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ab2ab5b121cbfc2d0680284cbe8b78f6/momuj.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/jidas.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/99022142900.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/nezomapegodajopoti.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/19614048959.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/mamone.pdfIn PDF document text
    • http://rs-entp.com/upload/file/bujomuretosaxolovegar.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/sozovoropas.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/82178501223.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/foxujavuxen.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/bizorakuxebubogemimepetej.pdfIn PDF document text
    • http://gazetavk.ru/img/file/38962246514.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/8430928063.pdfIn PDF document text
    • https://parfumzone.ro/files/file/34276848780.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/favikegojo.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/bebaxifisof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+to+word+editing+onlinePDF 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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 17064 bytes
SHA-256: 5c924ee376f5c943cf5ae5c0fc8ce9210efbefc1f809fd4f2163d0dca6283629
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10288 bytes
SHA-256: 0df37a8e35f3325f1ffe85cfbcd704afe571c73e083c985e07f0451c73677da8
font_02_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1