Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fa14ae1e61728c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 19:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 964227f847b48dfd596dec27b84283bd SHA-1: 5526c1a806e005d6883969507354c3c5f9de3e25 SHA-256: 05fa14ae1e61728c8fcee48ac28d9992808dd79111fbdad0b762d7c9ab80938b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://banderlogclub.ru/Files/file/bilamulozewedepunopo.pdf In PDF document text
    • http://studiolaviano.it/userfiles/files/lupediwodexajitob.pdfIn PDF document text
    • http://rsst77.ru/upload/files/sodagekika.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/25858071763.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/31608809273.pdfIn PDF document text
    • https://subded.org/userfiles/file/xapakar.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/65906523362.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/wubavitasekobofiwil.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/64635442696.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pupafigudime.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130de1e3647d---vufugipibe.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/682v7qngp86jenrg549vrbul3h/12540241467.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/62797144376.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139ecd932c94---vagupediz.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/sojofovusi.pdfIn PDF document text
    • http://kahasat.cz/data/file/koronifewukesomudatal.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/19110314447.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/85369735764.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wudemumun.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/20251877163.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/86719766509.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wamikope.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/dumadexalifo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/njmtdln1b62ubbt3uckdqbgsmu/7844228012.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vunijotaxaxizipetukofam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sheena+1984+full+movie+123moviesPDF 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_off0000c505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 11320 bytes
SHA-256: 6267fb2d338b8bd1c5f5caa9729cca26947af1e2fb4bf525d5631e3b761f08d4
font_02_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 17316 bytes
SHA-256: 0bd3badc60636fb49a645f968bf09ddc1640dbb674f87e3f525ad3145ad66c4e

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