Malicious PDF — malware analysis report

Static analysis result for SHA-256 c215f4b5d6a09627…

MALICIOUS

PDF

100.3 KB Created: 2021-08-14 08:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c7fdfcf76d4a3a7d04feb5251a5e4e5 SHA-1: accfb40b9f085006b69f5e951847309287a6c473 SHA-256: c215f4b5d6a096278cf34565beeeb9f88f03180a7c87d033966485533bae2d96
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised and disposable domains, likely intended to obscure the final payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/45442482619.pdf In PDF document text
    • http://sbcnepal.com/images/file/19287361444.pdfIn PDF document text
    • http://stasta.com/userfiles/file/83784937671.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/jemunoviwatabutunata.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa831eed59d---jofogamikiletoxuzugim.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/14906689985.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e1796d99caeccbf3c1d7ae60ad424de1/72748945923.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780bc259155---podinavuwoxokuve.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc9325d97---4372005137.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b246662cbbf---93969964640.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/nafufetikodovaxoselusezo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/16277172471.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9a242b66---damewirisusoroguwo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4388d6f5936875752e2865599ad2ea4/mufevekisewoj.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/72057416298.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/50943948010.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e183bc0bd---81539383584.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/rikapimasinixexakodoru.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kaitarjed1nqakg5stddqqvhl1/11837858400.pdfIn PDF document text
    • http://hibertek.com/image/files/20210717_053040.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/zuvasewezipezukom.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0ldj2erfukoaftv8rqqba46l41/juxakobasufofaxupalavolu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16103dc57d5306---23543478595.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/68442660477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cuanto+tiempo+tarda+el+vidrio+en+descomponersePDF 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_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A7 18504 bytes
SHA-256: 53bca7b2ee5404c47aa87beb8fecc7dc0df577b1659fa375f0338737669516cc
font_02_sfnt_off000167e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E4 10872 bytes
SHA-256: 709ce8f344a050133600a39db5dee1760ca30f0e6ac9988241eefa00483a7a6d

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