Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72d7f3ec01466b2…

MALICIOUS

PDF

82.2 KB Created: 2021-07-13 04:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 17b62862ffbfc9d3d08f9d6ce17e8931 SHA-1: c0cb9e954d1b7fc484ad1164cad39c12c50139b2 SHA-256: c72d7f3ec01466b2097911a3a60d9efa27f16bc9e87f149f115f4b356bf2bcd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm or redirection mechanism. The presence of URLs with 'utm_term' parameters implies an attempt to disguise the malicious nature by appearing as legitimate search traffic, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=word+file+converter+to+pdf+online PDF link annotation
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e9344b1c8a2612e95e6416bf57cb03bc/7605995510.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/kikomagig.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a8c23682dfef3394ea25a1f836871c49/56156338482.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/84695011055.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/64915278866.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ce3b04900---85242671305.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5a8c950766462f23b9dd09975348388e/rutowudenibidejitowi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084635796bf3---42857009004.pdfIn PDF document text
    • http://remobudostol.pl/pliki/janidu.pdfIn PDF document text
    • https://alutat.com/data/file/93861640931.pdfIn PDF document text
    • http://goref.ru/files/file/50494074565.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a202b5bb374---zawijasedakazuwuvudisot.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16072c31c4216b---48806268926.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/43769680383.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/rukudenused.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/70251939992.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16081871b360c6---39150786837.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5abc5cc4efcac175db9bc5ccdbadf1e1/30591912920.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087750193b54---13999180979.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 17532 bytes
SHA-256: a6fdf8c8cb37bcfa28916f84441c15639fdb71c32ff46b8d4fa3ddb87140d849
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10340 bytes
SHA-256: 4edb939e345136adb7fca7d551124af611d9b6c16a8963a588ec949955aebb25

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