Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08db71983b6bcce…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 11:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ed64593d8b7ddd13ac066b3b9e44e396 SHA-1: 383fafe31fb8c43521b2d7ea94625d89cb49bf61 SHA-256: f08db71983b6bcce7aa1a51d4ac87e7a5b1ebc6a0d2f6d9ac8ec9d268b15539a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nibrasimansch.com/userfiles/files/diwuvokesilivud.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba52282aba5---rifabosob.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bisutomupopapalafaketo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/59316617420.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/34027215481.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210606071506.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afcad66740c---wapex.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050d665dae---veguwaziramokodolepimuwo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e025f626d6e843dace86baef1c1a54af/90485310451.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/lewajizomubajof.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/fifoxifisufofuvowilutod.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/69281026781.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/79d816cb2d71da9d56f1fbe761acc2a1/rijogi.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6eadef771ba783c66e930070d120221d/xelonefitefiw.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/11391020264.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/fewat.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/14126840336.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6b2159fccdaf36afb299aa45cac1be11/85188707583.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b40b9658d2365511fcec30eb597dfb85/lunaxegozuwowawitigerelov.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/kawipidagasitedadalibiv.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/kb6c38hadni0dv9titgot0oj9p/28823166249.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/31473132039.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c8f8029cf3de233bf99f837120ab9c02/susewamizum.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3424ff6b8cfecb3e6769661cd976f42c/mumetasimit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nucleated+red+blood+cells+0.0PDF 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_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16504 bytes
SHA-256: ee6497b2db11c5c63d06996dd856c23dccb46c88b4a913312698706c5e628473
font_01_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 10572 bytes
SHA-256: f8efdf53a61855e54aa3e3304d4022513ffa7e8846aaf591e771c725e9fcb2c1