Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81c7bd96965342f…

MALICIOUS

PDF

79.9 KB Created: 2021-08-17 17:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3bbddf1ebe369e7cbf77222a948d86f4 SHA-1: 7908d85c368ec31f7030d4b8886f8d9dbd5e4b94 SHA-256: a81c7bd96965342f4384c253c767883ae936ce2cadea7034921e5e2ef28e436e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/62360232a8055bd6fab9d5e0a1c8d6f4/54048700377.pdf In PDF document text
    • http://eventechsite.com/files/files/7801544123.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/43276529424.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h0pdpmfn6ormnkarqbd780r9s7/89063253993.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/66274860938.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/legelomu.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/raxonekojusixebuvum.pdfIn PDF document text
    • https://sanidom.pl/img/file/sikof.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/24496828021.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/66385975784.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6o8bd23lq7ej8n5avndd3vvu2u/firipetexuderusuzagikize.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/wuzusujorinoxi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7bbd352c---kusab.pdfIn PDF document text
    • http://hanleyresources.com/images/sigimogawijonigavejez.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/21946971016.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa947937175---towodegig.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/89261161582.pdfIn PDF document text
    • http://rideco.hu/upload/file/jexatepux.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfb7a11ae---50543269728.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/gomizefodogek.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/nusofekawobobagadiwaxi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609587272fe15---93235982137.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1ap8eju1novpn9fk1ghn9anb2/44302379408.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608794887999b---bomimikinajev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=activity+series+pre+lab+answersPDF 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10632 bytes
SHA-256: 60c67901d357310137e31931200f6496532b7a545497481cfb3fed92d87e5427
font_02_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 16876 bytes
SHA-256: 4c1b4fd9444cee9efd4e24e56cf670d47419ef7280845b293d33abbcec339541

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