Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8fe178be9e6d37…

MALICIOUS

PDF

86.9 KB Created: 2021-07-25 09:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37e90584245ce2501c35ad2c14233446 SHA-1: f54d9dcbf6910dad76b0f24df01f57d4f4662250 SHA-256: 2a8fe178be9e6d37ea02c07ac4ea80d7a3b743d543d999d908f554dabe5032d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://automotiveenergy.cz/userfiles/file/tetozazawimepebenu.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/fijidemavesafonevu.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076acbf9d1e4---29953880565.pdf
    • http://zulaikhatextile.com/userfiles/files/bukav.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c787e739d97c568b1795811e451a5e7e/jatejosewuz.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/frcfth7dobdfh03f7uveapar86/tagefuzibet.pdf
    • https://drrajanmahtani.com/userfiles/files/xajutakesatajigoj.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6eba33129---fowopodopikiwedixop.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607709fee963e---833479464.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe69b7fb0---tewonimovotosugugawefagis.pdf
    • https://ncvpte.in/userfiles/file/ketezivonikogosiz.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/850ef1b48c2f3550a796d21c910e6af1/50352592381.pdf
    • https://communeouchamps.fr/userfiles/file/bivikikenobizawelokokiwib.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c323b12da1a---zumasesakom.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06c774651---41613136934.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16073a3e4a31ba---41028788753.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/juvqnulgs0jc566knasf8fr521/36638832487.pdf
    • http://morgancountyoh.com/userimages/14570482515.pdf
    • https://farmaciasacoor.com/site/upload/file/zabopotiwexudukuvifasevi.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3f7f3904---81793160635.pdf
    • http://koppeika.ru/userfiles/file/lakezi.pdf
    • https://fokusmedia.com/images/uploads/jitakipisekorijeli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+twilight+breaking+dawn+part+1+full+movie+in+hindi
    • 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_off0000eb04.bin
505db0551c54c494ff2de0027ca3a0044d7ee041e759744e5bf8646977c6da42
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 11312 bytes
font_01_sfnt_off00010510.bin
19b396152c41b3fb22d4e358f3ad4b9c9bce5c79ad6b7bfe29af419e9cdddf30
pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 18284 bytes
font_02_sfnt_off0001354f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354F 16792 bytes