Malicious PDF — malware analysis report

Static analysis result for SHA-256 1005730f24f3f95a…

MALICIOUS

PDF

92.8 KB Created: 2021-09-21 14:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d839011f0e05c2a5afcca1e04d2b0b6 SHA-1: e3a6ef67824344f4c35b1eda1f65cdb4ebbd0b5c SHA-256: 1005730f24f3f95a11757e3c2ce0656055a813cc9e1f71394baa831c3692e90f
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 WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=kotlin+set+textview+text PDF link annotation
    • http://enslev-anlaegsservice.dk/userfiles/file/kiruligozupopajede.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/1903370121.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/kapila.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/85477556876.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/06/file/20210906_042607_113.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/06f6bd2ec7cf70bbc63c90b0cd7bfbc1/daxiregede.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/99244207505.pdfIn PDF document text
    • http://www.toptehnik.si/images/nebegipiribavinomisotaja.pdfIn PDF document text
    • http://klpa.net/userData/board/file/53564593230.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161469f4ddbb14---biwowirofoterer.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/36cc2250ae43f2f901344b2070bf653d/19272327811.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/8059684150.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/wusegiw.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/96230789281.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/xafakoxadafit.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149100aa93c1---lanavofonidifikuf.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/xakuwofozafa.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/xowabibozelafaxuzasumezuj.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72854028340.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/79486cf789a092292e0872452709c9da/11902698360.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/mowitag.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/43274679120.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/48626784768.pdfIn PDF document text
    • http://naviway.su/upload/files/24754490612.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_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 10084 bytes
SHA-256: 33bf47b1c07c90d6336145ff0c1ae288e12cd8d94c24d12e8c3c03b75f1aac19
font_02_sfnt_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 19408 bytes
SHA-256: 13abe610bdbb81e2f254fbfbe888ea1d24daeafeb6aadc19c4b0a0891b76a059

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