Malicious PDF — malware analysis report

Static analysis result for SHA-256 394dbc9db3765431…

MALICIOUS

PDF

84.2 KB Created: 2021-07-08 07:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0b913f2cda85c89f8f1712ae9aabd67b SHA-1: 9363a8083ac5f7907fc8cc15e1de1aa73deb12e2 SHA-256: 394dbc9db37654310ea421f06aeff6d1a685855e3544f6cbf6550849050acc47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa941505d---gosogiwitezajaresowax.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7989463c---71729697060.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/33792246794.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gulezoxo.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/sajapodoraba.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/55874329570.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-15/images/files/34456418275.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bdd9f34f9413d5fed90214f39929e545/27143373195.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b33755b678a---vezipalibexagutivalidu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/14ed1c006d6b4e66653bb45fc51f08ae/18782169436.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/53450325498.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g5utqlq7ffj79vtq1u396u7874/2210155651.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/25601664396.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/73938787045.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kivok.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba1cc2f3e---tafuj.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082237607bc1---bijojaberumarosuvegi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d34222a95e7---biximezup.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/26632592480.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/2790531575.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3bd6bb8ceb699ebf43d73e9e98777c9b/fejezumukaladigogesis.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/53580549186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=saving+ms+project+to+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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 17540 bytes
SHA-256: 7e4b8c84a1a8b7560eab10aa28f50cbea39d932dbed05d4c420274c8855524cb
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 11188 bytes
SHA-256: c5021f8f6e83170943b5958e087f49fcc6bc0261457b186e83fd0063d94ff193

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