Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b176d1f2a59ea0c…

MALICIOUS

PDF

89.5 KB Created: 2021-08-03 05:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca01a2ee5cff28a1a91adbce878e023e SHA-1: 5e956efceafd245b98041ea47fb4a581a067ebfb SHA-256: 2b176d1f2a59ea0c33f78731a52c9c858cf704bf3a5f5abcf3d5364795fd8922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While 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 0.9977

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=superset+workout+routine+for+mass+pdf PDF link annotation
    • http://malopolskiszlakwinny.pl/upload/File/zogam.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kaboxikegosesejovarituj.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/65305157257.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7688a46c---subaluxuwifibifexenud.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77c4bf3c4c---kuniroperedejasaji.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/28244643208.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/46678451946.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ph86mkd6ojfam3u2r95uhov39d/gemifeba.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4594e2beb---80567946797.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/nubanafusipirinaxofelel.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/2ad4f40177569190a1afc9f229929c73/96518407160.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074533809e93---tizejixifemigusajanebeban.pdfIn PDF document text
    • https://paperland.bg/uploads/file/daregada.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dc25d0a26---32435869306.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a47352e4354---sokewalifoju.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/diwujesewukot.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/61223549619.pdfIn PDF document text
    • http://normel.org/files/upload/file/98276357088.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106cf160c8db---kuvefuxineboxofux.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09bc5baa19---vufopere.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/49698924997.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/832aac9cbbc58b4bfc1ea831e1b2af9c/tujewipepuvawuxunokivew.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_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 10968 bytes
SHA-256: e80e241e5e640f7081f4da2251aaf60f0311d3cedb32e69544f154d726165201
font_02_sfnt_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 17360 bytes
SHA-256: f1ce027b8465d14d3fbd64ac0e87e01d3c27e81982f6aac905cdf94bb9491f09

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