Malicious PDF — malware analysis report

Static analysis result for SHA-256 3524f1d9305aa97c…

MALICIOUS

PDF

84.7 KB Created: 2021-08-11 23:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ffed63df29a3f358fc5edbeb0569fa7 SHA-1: cbb9baa3689c5b1459360d43db8a633fe235d0ea SHA-256: 3524f1d9305aa97c46c53ad69881dd4a7b9fc7496f5bea0b0564ce782c5dade5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6f8edf89---xuwojuxezotubazevafeduk.pdf In PDF document text
    • https://classykitchen.pl/web/uploads/files/vimazanorobaj.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/wokanizarisuvuzuwebaromi.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/31409352245.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/zominixibomiluwamu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16113835389d81---vedopoxolunetupimo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609901e7d92bc---sodemevobuvog.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/porejebamubewifog.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c8fdc6d7a53e440db7042ed2d771dff/fawevijonupovokekolo.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/34237877468.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/61435680453.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/jetada.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/14094519107.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e33f14319---kuxivitufer.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2b39849118dc9b07a6a3c955e5ec76ad/74320224166.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/69634845715.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/nuralujesolulubefuposu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/52836d417a8e11c340494d7e62a5460b/rakamemefakusiduvasixub.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/6698478889.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/tulank8otaeppm9b0lot6b8s7d/dilopim.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/5711293886.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6be58bd32---vemomoxejomesomole.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/33205313903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lol+rp+hilesi+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 18828 bytes
SHA-256: d7c45addb166518d426fd4ee2fd8a80742210dd7cf63530b13f12d6b8434a7a4
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 10184 bytes
SHA-256: de277d5960fa890dfcd7d101ca29f3693d2fdeebd16a7e743ab1387e674c95f8
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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