Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1c3ba25279aef1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 08:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e868641d1e0ea8196f64a8eb49bd6d42 SHA-1: 41ba6c4a445e90ed1188056116a3aca66394d2c2 SHA-256: 5c1c3ba25279aef1cb561cfe2c82ef5ca411a7a8e33773fe3c4d0f67c4ca5ccc
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://bagliodeimille.it/userfiles/files/16617954967.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce06c816d2---32066524251.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73b817f8e---22359524850.pdfIn PDF document text
    • http://devveb.net/userfiles/file/nifamagoda.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/laxesudukida.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/63609602655292b845fac54fa66fbfb7/wadamefib.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a4d200f7---zawoxugibadipidonexevef.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3302edc1---sijog.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tot6ndp7th055rb5pf2h0jst19/16072447504.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c772fa8a---kapadedivov.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/68068157402.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/eded092cea6aaabbd3aa78b3e9b86001/wadofidaji.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/72711917516.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/17772247985.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607465bca44f0---91523481220.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f408e518---25583056706.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bti34l7al0bm5e45vnns5eh638/29962940406.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/85051995676.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210518232315_a4s8z5.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/tujumotopugobeja.pdfIn PDF document text
    • http://fittbike.hu/files/file/wabefafekipuvid.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/nutiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=arthur+rimbaud+poesie+pdfPDF 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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 19148 bytes
SHA-256: 854fc09aab9fc37ee4345aa5cd202ce56242d5cb20c5af6ddfd2b6331ad00a5a
font_01_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 10832 bytes
SHA-256: a047c8a43d5ce170b5cbef080a374eb3f3422e74be37e27762c35e609659ffbf
font_02_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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