Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c963ab60a75e47…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 00:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d2b8d665099fd3532409e40ec8fd36b SHA-1: 32ee5510a0897296bc6794a05ff8305f250932ef SHA-256: d1c963ab60a75e4724003b4f24e658fa506e4b998616645c74e98b5dd61d8ccd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, characteristic of a link farm used for phishing or distributing further malware. No scripts were extracted, but the structure and numerous external links strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://crewmak.ru/uplcv?utm_term=standards+of+practice+handbook+11th+edition+%282014%29+pdf PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a3268c71bb85e9714f14fa414b753ff3/70100619514.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b7a6705d9cb2dc8ebf4bdb6e6483de0c/46191424550.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/fudunop.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/guraxa.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/15541293001.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/73677725812.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210817175501.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/59dc901a7b70845b9b9e83029842d75d/8638032880.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b330dd3657a---20617638107.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/21946944379.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1824d869c---lixizaf.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/5935031640.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/64467108954.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/terop.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26a6e8a09---buvorilotonemeduvufep.pdfIn PDF document text
    • http://ashioke.com/images/library/File/52437986685.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/92868842855.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c2t36m9brg0u3k4ihos790bmua/paforenawojuvivojew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde03dee040---wupizek.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/padogezarofowu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/11s7ll8o6nd22senekofqlts56/kisebijuzez.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/8233273844.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/ziwafuwa.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabdcc7031---49642985026.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/96990528563.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/51793353663.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160849a14d4c13---80850114052.pdfIn PDF document text
    • 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_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 11508 bytes
SHA-256: 268e6a491dac300dd1b7cb44b778231cfb6de09a6c791a8fa43c3ce96c9cacda
font_02_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 17020 bytes
SHA-256: 78e162ce6e3f17f31ecfb59ebf799bea092f27f95750b879ab01b26ec219a136