Malicious PDF — malware analysis report

Static analysis result for SHA-256 2453796bf4a50321…

MALICIOUS

PDF

82.8 KB Created: 2021-08-31 03:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fd2f4dfc9662c579dc5ee3be4918d02 SHA-1: fa2e33649f13ffdcac3d2d54e1dbd45f8f8f35a5 SHA-256: 2453796bf4a5032184bd3099c20009dbc067025d5c7518cbefbd370ce979315c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=sql+is+not+null+not+working
    • http://sk-massimo.com/js/upload/files/29130169075.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8696f908---divosi.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3pjf98nhb8un4pu2ds3vhtfo6e/moxutebubedibekifobuli.pdf
    • http://ambvet-trefontane.eu/userfiles/files/vagezumowisufusudakumep.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b41ec877dc54e43f88e01f3b1ce1e552/67902878032.pdf
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/23664670865.pdf
    • http://uhy-th.com/image/upload/files/delulodedib.pdf
    • https://toptenstudy.com/upload/files/BodyFile__611E3E199FE98.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609498aadd53f---54076478543.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a740a9c58b2---kodav.pdf
    • http://savvyais.com/userfiles/file/bulipamenip.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/97137514137.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d5003889d6546a11c6a212d72d2d9ec9/gibigit.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/nimivixetotewado.pdf
    • http://poolprotektor.com/userfiles/file/tonimegobujumige.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c44457bed---9726881694.pdf
    • https://duproject.com/uploadEditor/files/mosafufu.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083387172bad---50782915211.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b6856f57---65771661698.pdf
    • https://hbphoto.ca/resimler/files/69185630832.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087c50ee4abf---90491765647.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8daca54a3c1f1057ca06238985a1d5ec/vugemagijoja.pdf
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/puragabuwa.pdf
    • https://tauthuy.vn/upload/files/basazowopomizavawuzufa.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_off0000df1a.bin
d325c0e276e6b4b2ba27734ddbfaccf5ee49c6a5b909cfb9918e4917fec7a1b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 17936 bytes
font_01_sfnt_off00010dd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 16792 bytes
font_02_sfnt_off000125e7.bin
3d4474773e8d798d7a4b72084f6f898eccf317e6384b413d2a62460723cdec1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 10488 bytes