Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9592eaffb400ac…

MALICIOUS

PDF

82.1 KB Created: 2021-08-19 12:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45f260022ee9eeb8f172340cd765e707 SHA-1: 9b1fd0d768523f8c3ce0859e3bbeed6b740276ff SHA-256: de9592eaffb400ac1ae2d4b7bbe67037a023a5457ec0fc8da2926eede0ee9a9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=tam+say%C4%B1larda+4+i%C5%9Flem+sorular%C4%B1+ve+cevaplar%C4%B1+9.s%C4%B1n%C4%B1f PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlqkvv9rldsjt8tqkq4l9cpt13/16611110071.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/20897639608.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d53dc9af---33734695547.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qpl88h85el2tn99va94sjbq6oo/10173387880.pdfIn PDF document text
    • https://mashura.co/userfiles/files/89662373928.pdfIn PDF document text
    • http://rld-carbon.ru/file/komavax.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1af948ffedd3adf6e3f164c4de239d1a/goxuz.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/kinevavemetuxuluxewupu.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/73021398198.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/roxiru.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712710ad473---mutorize.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/ridisomiw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3f7160d696d008b95c0db5538e7b8985/napuzusunetuboluxexizumom.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085543e85a77---16846026106.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b198552fb9---medebireluwot.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/b3ea2oagqnv3qoffajtl28u802/refof.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/zefopabakozopivoju.pdfIn PDF document text
    • http://abnicum.com/files/file/70785018482.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae8871f5a---76619262743.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/54052733646.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807856a2e9c---lezale.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/lonasivekexevibuka.pdfIn PDF document text
    • http://kodemari.info/data/files/kofuximo.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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 18764 bytes
SHA-256: ebd3163dd3c410f0ddeb2443640b3fde6d47d36178f0da5e54b0796cd4180d0c
font_01_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 11528 bytes
SHA-256: 1c8363eb6ad59ac46e8cf5dcc17095b09e40f475410f72083f269e1fd5ca5da6

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