Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f51371f2dffbf67…

MALICIOUS

PDF

94.7 KB Created: 2021-07-18 19:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c061bb36e10e32241e0812f3f6dcbd7 SHA-1: 2ae3983bd8fafd94ca3bc004408f6477cda92033 SHA-256: 8f51371f2dffbf6713f44e4752f67c4b9f145b98f527fa0806310bd5c974dc5e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, but the numerous embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/op03k4u796p1kcajl0l893can7/67268107922.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf1243a801---gekigegovuzitusoxe.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210706_556867A4FB03583C.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/75968159982.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/romuxawomu.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/04be3662c3ed0042b9701f91336db061/filufep.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e6c2f783e14902ad6c39950807deed85/22521682759.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dujosalufonefejodutaz.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/acdd7e9612b458187cea4b51f93e775b/12423958230.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xomepizovexepifemi.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/rekapaxutorefasaxana.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/rufavukupinubedelorimepu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5tc7ct1dkf64fi5rk259m0h7gb/wuxidarimejavewu.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/sqileb5uarnubit1307r7fo1q4/luruzavexiput.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/j8gspceligu8us74pbbmqp2jd5/64938861045.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/49997455850.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8f929045a23de2ec54f21a964eaafae1/nazutagaxiluxizugesex.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/59535471778.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/11523239204.pdfIn PDF document text
    • https://tavio.ru/files/file/57951559345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=anime+girl+with+short+blonde+hairPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 10904 bytes
SHA-256: f6dbbae6f91483ac607b5b42fcdfd1a9809f64fd7e4717b1c98845a024f7b784
font_01_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16932 bytes
SHA-256: cfb421a6e2f1cad3094ca11d86af0449f320ca852777cc93b90a2c9e055fbf97
font_03_sfnt_off000157f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F9 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8

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