Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dddf8f5a8daf502…

MALICIOUS

PDF

99.6 KB Created: 2021-07-27 05:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c8d56b6d2fb1891a56580eba077b47a SHA-1: 409c456235f317d6a48e5867e503ba23997d53af SHA-256: 0dddf8f5a8daf502fb47bf3587c40364fad6e0a81e6e5992026dbff49598a528
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The document body is heavily obfuscated and unreadable, suggesting it's designed to conceal its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75adb57095---39540460775.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7c5c3941---61938952726.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/96a7e85c425dea5ae4da9c194b95cfd6/mevadegobezapowina.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/rumeginuwamiberogoba.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/tjeqifgr71ufequbfa64kkj5t4/pasidifunitodilumekumegud.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d16888983415ddb598d0509db7256728/pejewa.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/25959351984.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/6oljf3eotglepa0davcuo3rc4l/45468355735.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tmbn4jgn6238ekgdohpaadps5u/dogeronasubuvuwusos.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/zumojeg.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8fd20012---goxumumodarolutumuwabefov.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/66694433392.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/difujofojukopif.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e47b3c885---90047269682.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191db2d77f---36615387643.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28007352522.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/79604428399.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c677bc62---88343038175.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160daba4d53c4c---xokatiji.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/4500400454.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/mugorepuganepigavenatanep.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/78279085667.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/80276172459.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/46316515403.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bv9bc8lc3c3o9ep2ahc3c3su4u/19038751413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mini+militia+unlimited+ammo+and+gas+versionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 22432 bytes
SHA-256: 2f5dc2aadeb39b09cc8522e7c636f2690ae36c9c2a301b4a1cb9840c2d97d1bc
font_01_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 3300 bytes
SHA-256: 40c9c0d732b764a6f5d14aa02fcf2b48752281278ad560722effaedc4fdf39e1
font_02_sfnt_off00013562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13562 17200 bytes
SHA-256: 07a252d57d881b6e7728f566032aa4393fb4d0aa8191bcbfe557f0905cab2384
font_03_sfnt_off00014ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001670d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670D 10748 bytes
SHA-256: e76b18f7ddebfefaacecd0dafb2bf527bd06a1f88c4a887498c0248faa4d01ca

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