Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f6942db1587836…

MALICIOUS

PDF

96.5 KB Created: 2021-10-07 01:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a63ed752ffffc9659c489ed50fb9f7a0 SHA-1: 227e51efa4abca6fe083592523580c0d503277a2 SHA-256: 50f6942db158783697a4c2a0aeadda8fd9e6f11a15f1a2a086b3d26491937aa5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=good+morning+quotes+latest+2020
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d86bbc52e202c13cfdeb2fe262fbea69/3366944094.pdf
    • http://doktor-okonski.pl/uploadimg/file/pegovakigag.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/semakunuzudus.pdf
    • http://soosanfix.com/upload/fckeditor/file/degufisekunikakelev.pdf
    • https://dodatnojamstvo.com/userfiles/file/gisoxubumewaguvafuzif.pdf
    • https://eminencesolutions.in/resources/userfiles/file/jibepelofe.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/19223171566.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20211006134605.pdf
    • http://alatasfilms.gr/ILC/img/file/41213078222.pdf
    • http://toshiteriyakiburien.com/uploads/files/88946358738.pdf
    • http://asavn.vn/uploads/userfiles/files/11437179852.pdf
    • https://ipekyolumedya.com/resim_galeri/file/kefozanapove.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/xexododilujekisevobemen.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae854fe7a---dadanogizuwavovebubejijo.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/wabedibutujit.pdf
    • http://rakkhunnursinghome.com/user_img/files/vefubananinojomixujav.pdf
    • https://ifunb.com/shopadmin/upload/files/78338430308.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210906135937.pdf
    • http://naim.naparts.com/images/fck/file/gijexos.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4bf1cb8d43ee90ae9e202ff14e82f5b1/86306469196.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145296fc22de---vibifo.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161387a562999a---29394149610.pdf
    • http://www.peretprod.ro/content-images/file/jiwezitimonepezepilegunel.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_off00010cbe.bin
3c6b041ef17c4a293bdcb8bc15bd5e7a809a1401e886278056a513e027ced312
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 11116 bytes
font_01_sfnt_off00012632.bin
4f06e045222c17f9564a301ef68868fc5a8aaa91aa37ec9264e7cd724ccce49c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 21024 bytes
font_02_sfnt_off00015bf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF5 16792 bytes