Malicious PDF — malware analysis report

Static analysis result for SHA-256 934ffdd5e0400799…

MALICIOUS

PDF

90.2 KB Created: 2021-09-08 03:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 10aa0e16c29687709fb6bcdca24b58ad SHA-1: 8bde99e0a18dc5d4a418ce6664d3e5e63e58f249 SHA-256: 934ffdd5e04007996b74b99b986aa5c45c114d33be5ca8fbe00fc342fd7cc45d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the manipulation of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zlato-invest.cz/upload/files/81783121280.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4de9873f327a8b71f38af72123df6aca/35286018313.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/30133146308.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/47452813735.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/vupugovomiwi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/tokuk.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/vofipawudanigupidusebabur.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160876d525eca5---68811660358.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/pufeguviwufaraseni.pdfIn PDF document text
    • http://huntland.hu/upload/file/71505281047.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/jatumetojudirumaxa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a816a31b690---5820760700.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f20239a4e14b5be5b0b169a84d888870/94901529027.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/zipow.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/a8020ba13715eea3c3d7525b5d597639/82114374432.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/geluxuw.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/78755330133.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/67794800954.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/002126b903450c4a3a8eda3b278263d8/58651886256.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/48474609659.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e843bb6c4a5a1b5a4bf872c98250d71d/83495366016.pdfIn PDF document text
    • http://crm333.com/documentos/file/89135509929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=importancia+de+la+recombinacion+genetica+pdfPDF 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_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 10888 bytes
SHA-256: fe9e10fafd0f5b441e453663178f0df6bfa6a11a939bd5e8df42c1c69362b8bc
font_01_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 18828 bytes
SHA-256: 02d932fa8a740f6a59be416dd0065a47d8175e7b70a199f525ee2b5067969911
font_02_sfnt_off000142e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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