Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fc341bb663eb00…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 17:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba896524252ba86f27b0a49acca7d6a2 SHA-1: 7f226e2c6ce70b686621a549a9d004476ba8ec27 SHA-256: b6fc341bb663eb005030a2a593a10014f61ed6dc873479967d6580b217de039d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/203df653008c9c62c4834d36c7f16996/vamobopiboto.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a030900719a---sogafek.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5de45de4712c5673d3d983470d8acdad/xalagugelobitikewif.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5287f7762c---sinovejofofavane.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077066428134---79768470058.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gt26pudlaoa05nr9kgrqoqulgm/73857789986.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2914115cf907c0f479b5fea70c49696f/rulenokeliji.pdf
    • http://aklond.com/UploadFilesfile///2021051811124838.pdf
    • https://abe-rdc.com/userfiles/file/getemexamofefaki.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/85e4e0c4c4509b968ffc4601417472b1/kizipipamotibo.pdf
    • https://bharatbiodiesel.com/userfiles/file/62075993122.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5ca4e9e81ec9fdbf5e278cc7cf7a6941/90616432459.pdf
    • http://altinay-law.com/images/file/joluzufotapolupapuz.pdf
    • https://familienbilstrup.dk/userfiles/file/folomonusuxe.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f5e0ee626---587678767.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4b8b5984d5d22b971dde2e7008903227/dasef.pdf
    • http://compufoxmail.com/userfiles/file/kodimapekivojixozute.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a43b7b1f2---fejemudijedupupadureziw.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/wipiwixevatedane.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/a000be414fb83ace1b3abc2cf044f689/dozobudi.pdf
    • https://stopserv.ru/files/file/lorura.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d3524d810---xelutovusojuwumepoje.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ae2ceae---majegakadofeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+different+combinations+are+possible
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0b.bin
4cc39ee6f5b7bdb9a1648b93bd849c56ca82d0fa55f50d5645f7b925504143fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 17952 bytes
font_01_sfnt_off00011d09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 16792 bytes
font_02_sfnt_off00013520.bin
1fece3c541b9d62043c17656426846660e363bd0b6f7695ee36e202cc73f2591
pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 11112 bytes