Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f730cce847da5b8…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 08:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0c29480bb867321ad32350fae086c0d SHA-1: 79c6e4dcdfc49639bea887a8afa7258bf0a801e3 SHA-256: 9f730cce847da5b8ddf9e01d20a9e6ba385f11d47e8a29a36798af648e06d6af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=prince+william+county+property+tax+records PDF link annotation
    • http://capital96.com/userfiles/file/musiwe.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/9daba2fb96d1a5fc678ef77c10ac41f8/bunal.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607053e6e09f2---mawuponawasupuk.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/lofunimezaxonobulo.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/zufusix.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/86851132430.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806162684ce---xerazeforemafux.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/08/file/durewiwemo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607177f108958---20123347253.pdfIn PDF document text
    • http://webbuilders.com/files/file/52891908477.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/86201284823.pdfIn PDF document text
    • http://sin-hua.org/userfiles/71312895648.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5c8caa5ac---22563768160.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072a357cd438---63659940564.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47238dbdf---resefonunuxi.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kewukawofalawivotowi.pdfIn PDF document text
    • http://guitarenko.fr/img/files/banepigasitizegefotu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/26564073001.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/11889743980.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cbc4819a47e840b933f8abd4f09712e0/fofudoxoj.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vhkr62qk7drklshl9gk579cm32/54755640316.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/16951813073.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609431bdebaf5---10739043618.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e943277f6---gupezivik.pdfIn PDF document text
    • http://mqskin.com/luutru/files/98521590397.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_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 17836 bytes
SHA-256: 17cf1ea0b03466484fe3d32b7a08a9e3bf48e423fcab5557c43f1b50ac084d99
font_01_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 11080 bytes
SHA-256: 4e3c9fbaddf280c9c114d65277e31b96467a5c39af21e9667fab4856250a0d57
font_02_sfnt_off00013b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1