Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f9c26c21a87272…

MALICIOUS

PDF

106.3 KB Created: 2021-09-18 16:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96e0f84363b11e7b309612581f7052c3 SHA-1: 9242f2800fc5c6e2aaffdaac75022ac313a5b882 SHA-256: b8f9c26c21a87272226fefb883d968adc32eb3e70e65983f9224c281bfa57bd1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which host other PDF files, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway scanning. ClamAV detection and ML classification confirm its malicious nature, pointing towards a phishing or trojan distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=zak+storm+mod+apk PDF link annotation
    • http://realestatespoznan.com/uploads/xubavapif.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/95692832546.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/57776166515.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/56309314424.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/lusuvejatesizobez.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/71740920731.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918072438788.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/nitefareluwogo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ece49e563e488a7265a5bf2b225d3bd6/8479652929.pdfIn PDF document text
    • http://195exim.com/datas/files/nodimufobolaso.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/kiwiwajukifabilonem.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/77248133629.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/71120558420.pdfIn PDF document text
    • http://redactron.com/userfiles/file/fevorofakabipunor.pdfIn PDF document text
    • https://allianztc.ro/files/file/lasurobipuxazurek.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5c18ecb9447da8771bdc0546604c5654/18005353715.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0e94ebbb---kabow.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/8506073370.pdfIn PDF document text
    • https://agrando.cz/files/file/vepasalolusagixefejove.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/16640412667.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa62944f1b---92696724284.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/xidegopub.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210906180323.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_off0001346e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346E 21432 bytes
SHA-256: 336869f340225bb96976542335e496b634289132c6bfc1c626a4ad9724bcbd36
font_01_sfnt_off00016caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CAA 10236 bytes
SHA-256: cb76768c795e77e30b8ff930917ebf2969395bc792ba035fde238a10a9f10166
font_02_sfnt_off000183c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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