Malicious PDF — malware analysis report

Static analysis result for SHA-256 0406a3c73bdebf5a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 06:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3208e1134c8932018266f0884890e2fd SHA-1: 9df7e72c040fa228bea1d5b4cb691e1e8277b2bc SHA-256: 0406a3c73bdebf5aa6dda58de65bb266664b656a95df713acd69224f5df4ff41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL targets suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f803bd00---vusesosimitexelupunowokub.pdf
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/25095403737.pdf
    • http://chanhungcorp.com/images/uploads/files/gajimebodowu.pdf
    • http://telegid.tv/userfiles/file/53631044989.pdf
    • https://hometeamcorp.com/images/usr/37107745763.pdf
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/6617212863.pdf
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/45481473225.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384288b4caa---22639524361.pdf
    • http://mweb.cz/images/file/wixebatavozudake.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131870adbede---turelasudapunenemarabewet.pdf
    • http://envigest.cz/upload/file/dozibo.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415ca1f1e65---24724778363.pdf
    • https://queensflower.nl/clientfiles/boxugefekunuzunalopegite.pdf
    • http://hoachathoanggia.com/userfiles/file/muvegalelifoxedajuzir.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210914_102033.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317907a3de2---matexumudaxabomijo.pdf
    • https://pmfegypt.com/userfiles/files/jowopimo.pdf
    • http://grawerlik.pl/userfiles/file/9376960725.pdf
    • https://clumba-indoor.ru/files/files/58161227525.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/51301634560.pdf
    • http://talani.nl/userfiles/image/file/39207156271.pdf
    • http://goforthegreengolfpools.com/userfiles/file/33727406247.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hanuman+chalisa+telugu+pdf+file
    • 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_off0000b4f9.bin
72324d3cf758a7f33895cce4ba57922aca61825aa115ebbcb061eefec1bb3513
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F9 16328 bytes
font_01_sfnt_off0000cb20.bin
5a3f8cdcacc544f8c7238316a49563f925350c0b5ab1fe0490bbf21a126e0c63
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 18548 bytes
font_02_sfnt_off0000fb7b.bin
bdfe40d39bf1147127b3218979cbf2561b40ab77065973b62cb81a3d500befcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 10940 bytes
font_03_sfnt_off00011459.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16792 bytes