Malicious PDF — malware analysis report

Static analysis result for SHA-256 e814fae1db62f6e0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 21:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c086e29b44731e73bff0518e46ec815 SHA-1: 9ffa14552e42ef5bfded87588d3bc646b4280989 SHA-256: e814fae1db62f6e00b08faa80b9e644e032f7b52523342d2b819442580b30c55
164 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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=apk+naruto+shippuden+senki
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/egf60k3cjgetshjato1k1qhiv6/lezotisekoxifitovepep.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/rafisurenuwatukofob.pdf
    • http://portalpr-b2b.es/img/user//file/_0374643001631945452.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/14059095427.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487bed95656---71156894775.pdf
    • http://technology-mp.it/userfiles/files/9310764364.pdf
    • http://keemunblacktea.cn/uploads/file/211344432013.pdf
    • http://j-club.eu/userfiles/file/51403866873.pdf
    • http://yjeverspeed.com/userfiles/file/42465961073.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7878e84f---43562109606.pdf
    • http://newgoodluckcrane.com/admin/uploadfiles/file/rewabago.pdf
    • http://madurastones.com/userfiles/file/kuregezidavudibajeguzede.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613058cd2ac09---gatinuxitewuz.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/tewalujekijivexemidomi.pdf
    • http://sanchariglobal.com/userfiles/file/tejarixudiwerabumixenavu.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ihl539l01chvogeq3n0p12vr25/gokil.pdf
    • https://www.db-ynox.fr/ckfinder/userfiles/files/sipusud.pdf
    • http://domadoma.cz/userfiles/file/zekogexisuralax.pdf
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/girupa.pdf
    • http://icltindia.in/userfiles/file/80026740436.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/18131097624.pdf
    • https://ekinyalitim.com/depo/sayfaresim/file/1407501266.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_off0000aee7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE7 16792 bytes
font_01_sfnt_off0000c6fe.bin
28c0692f336b4d19aa21423d482a4e0621789723ddaa9d504890a418ab0d6b62
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 10616 bytes
font_02_sfnt_off0000df41.bin
ee7d24dc02b6f1875904c3f288f476d2460e8a96ad3bab24afdf98f0226371c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 14628 bytes