Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee20482fbd5e1e3d…

MALICIOUS

PDF

82.5 KB Created: 2021-08-20 19:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f903fb94f04d40cf552db66d20c1a25 SHA-1: b939a9f20fb00255b6b7d5459fbb65dacef9c2f1 SHA-256: ee20482fbd5e1e3dee56ce8df95a2a0696b03e76041b25817a129a94dc9822e5
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports a user-interaction-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e4f8c0cee2427a721935065b6b6367c7/92499177497.pdf
    • http://levakov132.ru/userfiles/file/72576910104.pdf
    • http://tsg-edinstvo.ru/userfiles/file/nelemoziraduwogeken.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073d24506d4b---95117574772.pdf
    • http://piau-po21inn.com/CKEdit/upload/files/39716753150.pdf
    • https://togeltop.net/contents//files/80592367203.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cafb6a098---gegelawi.pdf
    • http://camionespanamericana.com/userfiles/file/lirezazap.pdf
    • http://familie-schiecke.de/images/file/pavimetavedugu.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f494ce3f62---pubevuxanejaponuvid.pdf
    • http://scottleddy.net/clients/862555/File/nojepol.pdf
    • http://moderncarrent.com/user_img/files/gemezododowamujewajef.pdf
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xekosozopuwagojasev.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/998ab03c5630e233477b93240178640c/75966447098.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/8343685644.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6480dc658eeb7389ec594e5e5b2f19bc/papuzugipu.pdf
    • https://bouwservicewinthagen.nl/userfiles/image/file/nabesobigixusubuzeximotis.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/30216859771.pdf
    • https://thebottombillion.org/business_school/uploads/file/47299676844.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7007b61554---jejuguxufinagil.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5i73bfe9j72f66k2r4esfrh48f/fepigot.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/39944195776.pdf
    • https://decoveinvestment.com/userfiles/file/16256270446.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c0fd638e4---ragemenadorik.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/df8d75aebe80fb1a5f876dd94ff2cb8c/saxinewuxinisomuwirokopeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=daikin+aircon+remote+control+timer
    • 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_off0000df8a.bin
ebfd3b99b76dc17603810ffa1a632070f90386033549777857c158c57788b724
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 10316 bytes
font_01_sfnt_off0000f6c3.bin
741f656add855814d30e8ac03f36bc272ef6fb03a2fa72c3f3fcf01426c1a927
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 17068 bytes
font_02_sfnt_off00012350.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16792 bytes