Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d08b74f4d7051e…

MALICIOUS

PDF

93.2 KB Created: 2021-06-29 03:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90200ef55106fb41af9685ce9e8f8be8 SHA-1: a0bc213202d781beb4cca327c892ea1472a11b04 SHA-256: 20d08b74f4d7051e0ccd079d6be5662e4b1c97557e3a3a385769cfb689b5ed79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf74f05f35---48078519459.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882125f386f---vavujelo.pdf
    • https://betenagro.com/sites/default/files/file/nataxitoradokemasuneti.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ef0b5b78af84883594e2f77b0944696e/25774179058.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfccee74847---jivikilebijajiki.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/3he0pq652lsu21ii86rki7ulis/forewevasami.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/04eb32900edba669ccd5d1eccd6db2e2/pixizubekobe.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ppd2ji07v0822jr9ufn0elfkv2/mavojipomew.pdf
    • http://mmdplus.com/userfiles/files/20210625_151606.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0cf4a2f00---83002679059.pdf
    • http://quangcaosms.org/media/ftp/file/zapegudojazodi.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/vlv8id7bm5poqsrrrqot4h686k/tematomu.pdf
    • https://majorsagilekvaros.hu/uploads/file/48521011801.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2654b066c4fa9139f8d5d27940b580d5/98314752585.pdf
    • http://seanmore.com/userData/board/file/zavizemav.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e04d3757f---79342939095.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/34cqdqpmf2smbk5l5aduffr7p7/rorolafarasarizegepal.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607527cdb4fe1---18862785918.pdf
    • https://tramhuonghanoi.vn/upload/files/xobazoxiwekinexobififanuv.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c10e31f68---sejezerimasojerajoxag.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086938d18b56---bixabinuxo.pdf
    • https://giolog.biz/images/bulk_images/files/32265762360.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/740fc7f216223e6222736f88b9969c93/moduwarajafugidowakoxilik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hobbes+and+locke+compare+and+contrast
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2b.bin
8a78756b9975e09cb8172a88f9f4bd715c8d58f217987f5eaff8a31791a2adec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 10804 bytes
font_01_sfnt_off000122d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes
font_02_sfnt_off00013ae2.bin
8acdee6a7f75654803454b682c55115dd95c3da457546a3e9510dfacf0b3fd31
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 17176 bytes