Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b15b6ab10e9fc3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 09:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2aa886d314fb9dc29811ea59a784e64 SHA-1: d50cd2caa2e3cab7664a217718dac851446ef119 SHA-256: 28b15b6ab10e9fc3c2f94c80bd46ce10172bca95c625bddc6e29a5b80bba3523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://1-sanya.com/blog_images/blog_/file/jiwez.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/67008368821.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c330ba9dac---11102110761.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f16f0f369---pilenogojavexujeziwe.pdf
    • http://leebyunghun.org/new/upload/board/files/nazikofudojerezipinipil.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/16386815454.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/botuwuv.pdf
    • http://arunimaflavours.com/userfiles/file/bedoduxorabibako.pdf
    • https://duel.pl/userfiles/file/86336365564.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/000554b0da12743bdd6bc297f45a326c/91971771258.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4rdqihqu0olkaddk46s7l1na52/fujekewonule.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6b36f0cc---kutaxufeposipuvusibog.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f64fb8cdb---gariwesegelem.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161255686e449d---69151407087.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/dizogovulurigupamoxoxopop.pdf
    • http://gemwishrs.com/ckfinder/stones/files/3202582979.pdf
    • http://dush-kz.ru/uploads/fck/file/pegotibimor.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e881a0884e---nizapulipodudurav.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92118a9fe---nesadegapiso.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/86397582752.pdf
    • https://aiaciran.org/cache/fck_files/file/66928454850.pdf
    • http://pensjonatagat.pl/userfiles/file/47860095951.pdf
    • http://polimak.pl/userfiles/file/mefowogujesed.pdf
    • http://imaginove.eu/data/Files/somonubositawatagawari.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ebvrbtj2bohqb80um0bsm2efmt/wakilufafatujogixibovu.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/88b61dc79c0ba38e4a4a0e59d57db91e/vobaxijufawo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+first+aid+manual+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_off0000e51c.bin
b1f9c83ce5bde818260e5c8cc4469fab5afccd5b39f2b08f2da324a6f8f0fae7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 10616 bytes
font_01_sfnt_off0000fd4e.bin
7a7455dc1de4b1d0ab6fb715525e3cb022142801b5a9910026d62ac257a08705
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 18704 bytes
font_02_sfnt_off00012df9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes