Malicious PDF — malware analysis report

Static analysis result for SHA-256 009fd7ff7ba98d01…

MALICIOUS

PDF

88.2 KB Created: 2021-07-18 08:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8dc163506c0a9e2697e686e351af0e05 SHA-1: 87ab690e7c35f0c0732de6e777285939da939ae6 SHA-256: 009fd7ff7ba98d01f6b9cb860cc76cf74c0067c1a89b1eae21391efaf3b7f23c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress installations and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous links, many with UTM parameters, reinforces the phishing or malware distribution intent.

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 http://llux.vn/uploads/files/bifubulima.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2200ada2a---68714886592.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b070bcb2bb0708c767649b46f4bb298/gidanimowalotikosal.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qnk0qnf31udobmghqu23cr52us/fizaxenagokubazimerefofid.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b83a4dbbb---73402357366.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/bosakiwekatiroxovizuv.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/dinomitikamufuwavogize.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jowetudezedin.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/50579209513.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rokifusebuwivepakij.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e53a2c8b83b08379f7f366a300ee320e/mepabukogirolezudi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a305226a1---92262878645.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/95d0ad6b9b14e7c4ed4dff5b74a7cf8b/21833127379.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead917f58a---45398678071.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/guzikafanolasegopajit.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/nlntvci0t7brnf3hpjlhp795u6/rujusesopevorapuvi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67c9877ac---7976503768.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/83e4fc233f4566f4588b5a1d293f15f7/zitaziziju.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/muxukemimelubibavikux.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/ruperazito.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gc8m4arro6hqsqegbb51q8erfe/sewupikalubizegudam.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/404ee8bd8d5183a7b1ee5617cf2c5fde/rusavotigudupi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160984475394ba---kamiwisebafevunibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+hypotenuse+of+a+right+triangle+is+1+m+less+than+twice+the+shortest+sidePDF 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_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 16556 bytes
SHA-256: 6b1c8ce1b5432b67b1a616542507d4e9b2698dd4a98f2ee93c8e74321f74846e
font_02_sfnt_off000137e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 11380 bytes
SHA-256: 7d867a114e3ca824914fc9a8b5adfd9c410cd74c8aa5c53c08fae08c5f4d98b2

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