Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ad514e8551e605…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 12:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b8aefcc3a0f5d7b682587c329f35d8a SHA-1: 76b1e45deffdb6fa46c7d4336b6bc689add90d17 SHA-256: b6ad514e8551e60513380a465efd3c460a98ff8ca55f723cc4ec831416ca353f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a download button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a343167fd85---1277090200.pdf
    • http://ranaghatpchsschool.org/userfiles/file/rabudobux.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609531367300a---vozajusug.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612553f192a01---56281188129.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/24710524195.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5c7e22595b1a14feb8e9b276c031cf7b/75577754911.pdf
    • http://gamax-motor.cz/data/dokumenty/ripufojojevutizet.pdf
    • https://majubesar.com/contents/files/dazoxub.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d727fbb086---zawulemodupakesusob.pdf
    • https://pabrikangka.com/contents//files/62700181610.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/61541241256.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/jeribuniduvasijeri.pdf
    • http://mevlanaasm.com/resimler/files/kedezanaminag.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8d833557---32548115967.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610296f995288---zigosizit.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/manematogujoki.pdf
    • http://aite-materials.com/upfiles/file/95089378716.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/zosebomukevujisagigiwu.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fbbf5caf5c2e2963c4269c1eb665fbcf/38022026619.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f918963c95---bukaxu.pdf
    • https://iaido-iaijutsu.ru/userfiles_exc/sulakotasulasokogapafoj.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/85780738546.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cgegis+table+2017+pdf
    • 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_off0000cb9d.bin
d521dd7630763b87151338d343ed6cd4c40bcdfa8a8230af8b6e30866f78cab8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 16904 bytes
font_01_sfnt_off0000f77f.bin
ca3e5d8f0571ba731c5348a1c81a1a8117454694a4ae10182a9f9d3f5de4bb0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 10864 bytes
font_02_sfnt_off0001107a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 16792 bytes