Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6a9346e5ba60a1…

MALICIOUS

PDF

102.4 KB Created: 2021-07-03 12:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff55ab9360e0c5b1d4587103d4b6678e SHA-1: 2603d8c2640d59a3355535de251b94b45d2a962f SHA-256: 3a6a9346e5ba60a1a6ccc5c1a4655fe30523d65a875b305dc2f359c9c43e9ac7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The primary purpose appears to be phishing or distributing further malware by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://drafthe.ru/uplcv?utm_term=unavoidable+in+a+sentence PDF link annotation
    • https://lapalettedesarts.fr/gestion/file/68680355024.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/34887206909.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/30tgsaprk6j0bprbvpp4njglac/69856075857.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6164bfb312e64df2dc83ef06246a6489/rolur.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a390368c---wusafebusalizasiterojuwun.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/40255763968.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/936a19a6055c51270b2adeb27dfc6a03/12898981770.pdfIn PDF document text
    • https://ekransamara.ru/files/17496729519.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815059e5aef---4109098595.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/24640248244.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210528_7292DE3515D95B5E.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5e97cb9a---31117263228.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/mabaxarumozovakupapaw.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c0d8b46bb7458dc3a67f1d0d834b92a1/77264772075.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081421c074f5---19397133427.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/nekamutugitepomiwinapup.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e21bf7ef---71505948940.pdfIn PDF document text
    • https://stopserv.ru/files/file/jajizumaj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7258f65c---63101081043.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c594bc71a20---topotuz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5cf39ee5---mozozexetilupekize.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4566ff198be9b31dfc4eea1280029b8a/26209892268.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 16488 bytes
SHA-256: cee8f2bd24437f599d234b9dc1b58df3d509ea4e0217646d2c452635de325fc7
font_01_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 18024 bytes
SHA-256: 87f12a517adf773e65925b462af9f0a744db3a55d703a77e518b88895e4ccd9c
font_02_sfnt_off00015c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001745c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745C 10476 bytes
SHA-256: ec64553f6aed6368b7c9574ee16c098dab83c372ccc496f1cc89516335da4b5b

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