Malicious PDF — malware analysis report

Static analysis result for SHA-256 096dafe8e328cc10…

MALICIOUS

PDF

92.7 KB Created: 2021-09-03 06:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 937a59d2c8fcf751a5439783a5d7afa1 SHA-1: de8a82c0938820d3739e8caed1c73ca9dddef74a SHA-256: 096dafe8e328cc10db88591300ccdc81e8938a33c0bc806c9f47ea2fb40eb9bd
176 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains heuristics indicating a password-protected archive lure and brand-impersonation phishing for Microsoft. It also includes numerous links to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish for credentials. The document body is heavily obfuscated and appears to be non-textual data, making direct content analysis impossible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mims+book+pdf+free+download.
  • 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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bjqop2r1uth90j52nrjg6uvq7o/39575523817.pdf In PDF document text
    • http://phongkhamthienhoa.vn/images/files/41563881790.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/bejesuresetomekapevo.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/24650588394.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/28460361941.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/24941038225.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf03c3efa---gaxekobatuju.pdfIn PDF document text
    • https://iranjobex.com/cache/fck_files/file/dixizoz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3rt67k349v3jacl9r472ircq3r/wekebesorupibad.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3f404c34---meripozuzagasa.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4764c1aec009aa0b7d5df99a011ac4da/53012864666.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/32745609171.pdfIn PDF document text
    • http://irollee.com/userfiles/file/zebovimexuparogob.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/tufabexaverajiresefim.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/3156551736.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/57892540828.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/94036253769.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32452ac61b---40626685816.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/ac28df12981bae7fce8b6050bfe2d2bf/mofezanowizeburi.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/65852281630.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b1342fc68cdfde44a630c773e8fc5c2/najumiburo.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/bebetesugipulisu.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/suwizobale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mims+book+pdf+free+downloadPDF 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_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 19636 bytes
SHA-256: 05c9d9bf05b8a921a92a04cdafd3ebe62e6e37bc614d4644c66c40aa181349fd
font_01_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 10872 bytes
SHA-256: 05d1c15b62c750c1eb67c9c3ad183c351e6c5630c4c0e4c25613829d2ca2f8a5
font_02_sfnt_off00014d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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