Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa83bc58136c8e74…

MALICIOUS

PDF

105.7 KB Created: 2021-07-04 07:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2330980a2bfe13c93c298a57bcdf48a SHA-1: 4012a84dc3fa402a98a484104ab77b944a6264f5 SHA-256: fa83bc58136c8e74c7b1e6849e7f2637825b09664fa4cb77231d0751907124ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://philabc.ru/uplcv?utm_term=analyzing+dna+by+gel+electrophoresis PDF link annotation
    • http://www.gesas.it/media/mailinglist/file/lesawe.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/bd5f6f2316270fbb480643eabf0775f6/rabujujivevatotegopuxelef.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/janakovukakedubizagaf.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/wiriwojiwomepusijelu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f145faf62dd7d56809458a7f46feb6fc/65176288318.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b469a5478fb---paredewadakafelax.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/fadukebadezuxiz.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wifaravasax.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e63fb63c32b111137ada6335acd60bd1/xijebijixoguramuvexawelu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/70e13d80a20679d4cddaae753df9fcc4/80373833420.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/74602965722.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/1664484763.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/81e537b010c059cda85e5577a3015a11/rumafavoxaberi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/28c00e730048f45341932e22983497dc/dikekezubukodorigube.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/38528498834.pdfIn PDF document text
    • https://badrivishal.com/media/77234207937.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942dac5cf8b---tasotujide.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a388f3057---65344564776.pdfIn PDF document text
    • https://arendic.cl/files/mokekupojugadarobuji.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vewuwedokavepofeben.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b66a406626---17035870668.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/79681036d8d24005b5415ecc5be0a243/65597210631.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210524023124.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/41fe43ab2990f8b13a5f74a3da982c0c/71726177820.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/36697012243.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/33803332155.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/wugelewewaxosusekesi.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_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 11088 bytes
SHA-256: ad7c5967a97e8c2b0749d6c68c3a9ddcee5cae65aec4d833b70c530ed133afc0
font_01_sfnt_off00015509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1B 16840 bytes
SHA-256: 8ac8662578aa31fbb4b059db92dad51ef15b9113a84f61da42efb7af6d3a4a70

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