Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b0f5c7ac45a09a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 19:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbead985ebab10d256861656457df495 SHA-1: 8c2a2fe8f63928ba02fecd076d9ed0b67a181bc5 SHA-256: a3b0f5c7ac45a09a607b10e194f5bcd18a23606112df9d3c7cba842374d5a3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. Static analysis revealed a link farm containing numerous URLs pointing to potentially compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baab46c2ce---silivurofakodagezunonu.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49145222fed7b87230536e499857854b/xibulexefemusilekufuturu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/23059550194.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/soneridotisedesojonuf.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb448617026---duwavedup.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rveu0de6rtlmqr9mq6m8jbi3in/58427268906.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d10904861621cca3b6197ebf7d2e6efd/tanikoxufefuf.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/mbjb40t2vocupbg7qureaa4g19/monisuvogekitofaze.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/94542487709.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2a9d7cbf60773b6c57b82f1c57c6c908/zaranilixazoti.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/53011052891.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/famefageboraxokemigebanip.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/lizerevalukanufej.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xogerafaxila.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/9926856727.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01d92a1d13---47434412.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0eb9a87a---rexudabejesejasanuniwelaf.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/74098117375.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/39677699884.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6fc321ec5776aa41ecfb7e6bbedcac87/falokapumarud.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/59f4b8902955777a2969f241045454fe/xusetukina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=word+search+easy+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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 10484 bytes
SHA-256: f2bb32a7f6ef57b150a27f7b470426a08076f462430146158147220cdc2c34d0
font_01_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 17360 bytes
SHA-256: fbb2b830af8f9629c2d4a00fcb9b88da0d589fd3583aa494e3467a5199f24f8e
font_02_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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