Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a77993eb460dea1…

MALICIOUS

PDF

92.8 KB Created: 2021-06-27 08:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c15068abd8df77a8053981b3b0450677 SHA-1: 2498c4e70edd7c9acaa57af7e3a2f2daac5d2b25 SHA-256: 2a77993eb460dea1e4f5d07f2452a7e1c90ff3aac31f2cbd8498bcd6581b4553
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/samojerejukamizabira.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/814159ed8f17def9132482e9c3f8748d/20239847828.pdf
    • https://eucolait.eu/userfiles/files/73768405971.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/honeduh9dskh29hfrvs0iv77id/xavinidurusiboripexut.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160834ecb6086f---91641508746.pdf
    • http://beijingbeat.com/contents//files/tisodavujad.pdf
    • https://sport-jicin.cz/dokumenty/xesid.pdf
    • http://mdsalon.ru/img/lib/file/37221517937.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5e09d0ff---fenezegokowarenowaw.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/954lisdh696l73is4pjl5j5mpi/jefed.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3818d70afb09b8361095baf50d1ee6c5/zaluxururiwifabituze.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/63335430064.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8815c4e347---mitufirepizuxofebuzezujos.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/897mcnshjngir42ko2lu29objo/55101903676.pdf
    • http://tvkinter.com/file_media/file_image/file/25280923259.pdf
    • https://dovolena-jiznicechy.cz/uploads/14278405855.pdf
    • http://vorne-sitzen.eu/pcms/content/file/12106968032.pdf
    • http://kleiberit.ru/files/file/89555361789.pdf
    • http://geredekombiservisi.com/userfiles/file/gepelebebaselulamorez.pdf
    • http://gps-tw.com/CKEdit/upload/files/49924995920.pdf
    • http://zulassungsservice4you.de/bilder/file/muronomazadogererigamepo.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/9bccf0dc450feb6de3d063f67e4d42f9/9600113294.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d319a154d85a3fa038fbdb4360214450/mukuwumolakefetoxus.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ecd6a5502586af6002898b0903348cb8/42027752993.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/doom4b8ovgna8dmeuk50fi29hp/nisutudijojazagubonabik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+recover+contacts+after+formatting+phone
    • https://mediaget.com/userfiles/files/25778002170.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 16792 bytes
font_01_sfnt_off0001039a.bin
ae4fc08bc232e607380a2e434ff6fe20e4ad0dfd1df6fa55018be42687aa436b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 11024 bytes
font_02_sfnt_off00011d14.bin
c4d6786dd34bc0e9539a452001b86addd632e5298f1a61d9dccead449ab1def3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 17176 bytes
font_03_sfnt_off00014a69.bin
308cdd3cd18dbdf771135b0fd881f9de5302b4c0fe558c6120842a7ecfb0aa36
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A69 16928 bytes