Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c961c8f485cf2ea…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 06:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9330fd13ba76bc80465e94ae68c90f65 SHA-1: 042418a6fc20f3e1cb85227c11edf7b2e83b5a81 SHA-256: 0c961c8f485cf2ea059fc81bc93512b4c3996bebcafd31eed6ab720582e72c23
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. This suggests the document is intended to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bigsvatcharasith.com/userfiles/file/dufujitenizolugulofopugek.pdf
    • https://vestol.bg/files/file/49956298277.pdf
    • http://sl-light.ru/design/img/upload/file/litebavajipezutowa.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd71f2e3d3---97232294613.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d007209807e---feberiraxalusulo.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d415579732---30078532183.pdf
    • https://systematix.pl/userfiles/file/47619189789.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9d6029674a5999eed761e726100ae432/83380880158.pdf
    • https://peiitw.com/Upload/ckeditor/files/37690521583.pdf
    • http://challendor.com/fckeditor/upload/file/96525299988.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/43a311d7819ba97d86ef92314a00fc80/72472305228.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501054322833475.pdf
    • http://bortran.com/upload/image/file/20210516125824.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/77f8f184a5a201b1d443645f0031a97f/zivomutulun.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d1770d969---89560354186.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c09d65b81f3---9620841500.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k0perrssuv8qoj9r7takh4m337/47464408972.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160da727b40bbe---pipoxafag.pdf
    • https://doublehair.center/upload/ckfinder/files/vifebawepowozoz.pdf
    • http://amy-tsai.com/images_express/userfiles/files/5053116110.pdf
    • https://gregor-biffiger.ch/userfiles/file/javepevuvilezalavumutuv.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/xeriva.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5847074e---87005461450.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0226838d89---kunutejesagagegij.pdf
    • https://mecaniquekd.ca/upload/file/sakoluroleda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nonviolent+action+examples
    • 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_off0000eddf.bin
143e5edfb907b225198d315efdc813aa4a057cb0a88d30ec35df97405e4ff7d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 10580 bytes
font_01_sfnt_off0001060e.bin
0cfd718e77541a43d1a6e96e0132049b4dcb098bd4736abec4db0f989fbd76da
pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 16528 bytes
font_02_sfnt_off000130d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 16792 bytes