Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31b615afc408303…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 18:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63a6decbf5b8cbceb5a655b7b25250ac SHA-1: 8042811f6076622ff325b489258a9b99d7b03ff5 SHA-256: e31b615afc4083033b409608a2e0a64b91863822dba635380f9dede5f7ccd4c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a deliberate attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=super+mario+c64+download PDF link annotation
    • https://gizaviation.com/uploads/files/vulinulenotuxewikotitas.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/basibuzuredoja.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/nazufojuwufikadatebofe.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/dakipuv.pdfIn PDF document text
    • http://vaithun.net/upload/files/wewesazokuxemulagi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e727e184db---26700277422.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/87674506106.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xuwakefexo.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/38287918385.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/ludirujijuwijatizetu.pdfIn PDF document text
    • http://megalaserasia.com/upload///1829598534.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/kevowonixefatoviwumaso.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/nekadamusarojezori.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/14666597908.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/21230380902.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/50671971161318ed6895a0.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/35119418303.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/gufekuzi.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210914101554.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab5db404e---niladatav.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ef48b1eb---xusawufiluxo.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/fetirejamun.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/8686350072.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd671186c---52699937888.pdfIn 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://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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 18484 bytes
SHA-256: 5b84c4e5642b6e5d5794d29840702c24d29c910a9c8ede7749191d03852f0d5d
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 10916 bytes
SHA-256: cd157a5945d680f16bbfd6bfb185605ddf31e50d4160da5b845ad9c90381a598

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