Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b4f799646174d8…

MALICIOUS

PDF

95.6 KB Created: 2021-07-24 09:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b07d3a13108de3082d14b9df86eabfe7 SHA-1: d3b7bb2064be6ce2e38effebcfd875567735bd6d SHA-256: 61b4f799646174d868a30277f2b72cfc8abd673342e52f7a17be015de03f63cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b780ccde179---ganasididulubuvixitan.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160925e7cf3712---2023169196.pdf
    • https://sukhayurveda.in/userfiles/file/wamej.pdf
    • http://babyschultz.com/clients/72285/File/98508639506.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160791b7c2d839---22942589947.pdf
    • http://alliusie.com/userfiles/file/2017315165.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8481e9edf3---52445790581.pdf
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/vanowamale.pdf
    • https://mmszke.hu/files/file/18299953195.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7ac5916e95e3ac73a684259cc3d0d616/zaxejuwiremoxodofat.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca1098325---dumuvexebovadep.pdf
    • http://associatedreclaimed.com/userfiles/files/65606333002.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd5fcf7bc---biwamakot.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f0e474342e07159d01494755f40f38f1/70322437085.pdf
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/sebizikolilenolumojuranew.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/eggrr2are3iqehtpl14bbrjhv5/lanajuzenolubaduk.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ca7d7c4a---88531871236.pdf
    • http://weingut-suppan.at/files/91446764363.pdf
    • http://msslink.ru/userfiles/files/zuriben.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608704b95b706---kiretirulenu.pdf
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/9528317748.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2943dd3e3f413f770a6f193f625dc1a3/43703875750.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/womitoxepivuxaxo.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/83153f361b7f8a82833eb45a0378951e/93779191834.pdf
    • http://monkey-do.net/userfiles/file/11724882616.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/43702821430.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=t%C3%A9cnicas+b%C3%A1sicas+de+enfermer%C3%ADa+macmillan+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_off00010b6e.bin
10725d1a1f499b9aa8f126e6ec9b30fab64d8562b86307e1ed9428e612f66f9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 19432 bytes
font_01_sfnt_off00013d07.bin
99afa865b789186c78a075c65e1702b56d5973db81f250300994742ab73204cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D07 11060 bytes
font_02_sfnt_off000155b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155B9 16792 bytes