Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24852483737ae6d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 20:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90c197f241e4cb13282129412af7078e SHA-1: 7d722643f5de1b0e7a967ea68375feb072f8a8d8 SHA-256: d24852483737ae6d323b4798de58386cfb39a25ff5287923c17b5aeb96aa0976
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=docx+to+pdf+java+converter PDF link annotation
    • http://lifecare4all.com/upload/files/8224182143.pdfIn PDF document text
    • http://efrex.cz/files/file/28733241730.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/a2hcolh8i37tludhvrr80i1a5i/26338005617.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882784114b1---zaxezidirigogepotur.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3spgam02dp9c53bm7hg65dbn31/rizusodudajuzuri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc5a62d444---90125081663.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5665c5b26d---68522297064.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f0c4cf4a3---valokiliwopufesul.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/weboxibupiramewonejuri.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5afa58eff2---643042908.pdfIn PDF document text
    • http://foodchemsino.com/d/files/vasivevixavumebusobog.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/tovumenuxapusenebojad.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/bosuf.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/gt235jo0kos03d5a5idu38mq62/52718156871.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/xanazaxigovixo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b2a33dcc---padekawakexanizemosuta.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/wumotuxalilevimajod.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/44030972052.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/55ccd0157dfc0563df6919d0a94ea5e4/66434011928.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/retukolifikovapoko.pdfIn PDF document text
    • http://slsnn.ru/content/files/65237224349.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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 17464 bytes
SHA-256: 2f0a77a9ffe19e6a505bd5069a266a6ac3a7ec8937b0b7baa16fbcc7ba77a1ff
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 10608 bytes
SHA-256: b08a745922fa6de451ef00cf98755feca4d538e459dde3bd3e9b50b3fb522006
font_02_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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