Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cda2397fcf1fc90…

MALICIOUS

PDF

165.5 KB Created: 2021-07-24 00:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 07a85a8bb8d8c2a754bb8ea7ee779ec0 SHA-1: e0cbed3465aaacacf7f0ed6cc70ac28cf09adbfd SHA-256: 8cda2397fcf1fc9073cec4582035f958d71db1ca6ee8add1cbc5364d4d9799f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to lure users to malicious or phishing sites, likely as part of a spearphishing campaign. The embedded JavaScript may be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ncei4cphsd16i2el9oev7vah7/7904225070.pdf In PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/51045042680.pdfIn PDF document text
    • https://wecareprogram.org/images/file/vuwesobugigupedekupi.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/mubeluxedamuzumoremigan.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cea7d6054e8---52958466111.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/71143318730.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/59941621511.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/23075253945.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/zisovedo.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210701033728.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082714e4e0f1---76423821462.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/do5a8f7n3eoe5acf1vgknqfsok/25480908610.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d0cee3ea7996ea9ad2b76d600b1554af/65312066148.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/gixafu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0f6675ea---logixuvugusoguxobine.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/dunezufamifogizugu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/nukazenizav.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/66925395021.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bba751537c6---12714203681.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jol4d5vtdnsv475q6l095n6s45/88708704479.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210608015828.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94866720d---vijixolilenijafi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f682bcf403b---wizesenusipowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+subject+matter+of+rural+sociologyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2248F 17696 bytes
SHA-256: d553220113049c6b1e674ce421a54010a53513f2fd4fa1e9a53cee5206b8c42a
font_01_sfnt_off00025329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B40 11156 bytes
SHA-256: 94c41ba28c6fbcbdb784f4bea82b9fb8350d2e667a34de628b6113c16bd9136a