Malicious PDF — malware analysis report

Static analysis result for SHA-256 a698d8d10eaa2b56…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 14:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e28ef4776050018881223efbe1e476f9 SHA-1: 1eac326b3b20272f3ffcfbec9efb229f75759bd2 SHA-256: a698d8d10eaa2b56698e1dd23774b32fdd79052fb874f126809545bce06e1d92
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=molly+bloom+wikipedia PDF link annotation
    • http://csc-0898.com/userfiles/file/20210909100028_iuhmg6.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae665ab2f8---finadumotododinapefib.pdfIn PDF document text
    • http://blccy.com/userfiles/files/80752941603.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caaabbac95---bipovigofokuzixogigokupo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/098d34ea9a099f233ef75a297b55a65a/40634477969.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109020053076315.pdfIn PDF document text
    • https://swiz.eu/files/editor/61526127940.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/tefemofum.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/63358452492.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/73889900154.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/firagikazabijonek.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf69e1932---lisunowed.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/famuveluxi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dawudobodutubisapadojo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614009f37b144---dadufiziwabexokudisi.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/9587064323.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/75061118049.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/malipusajikovubekovetabav.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109081253086749.pdfIn PDF document text
    • http://dentali.cz/files/files/lelumupobozolibafibe.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab8704c18---sileweda.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/rexiparifupowuvilunozuvin.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/29136594309.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/51956265714.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc6f58d0132a49b9737105231d92f687/kupavegil.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/57035613103.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_off0000bd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 10508 bytes
SHA-256: cce3508286ecbd2b4fb5721eebe1420613a3e936d5386248764cd68bcb03d513
font_02_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 17136 bytes
SHA-256: bb2071326bd577cb5a53813ae95ba7401103baadb462f941bee6f1770335faa4

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