Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d722356672fc47e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 15:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7f7402cd6e0f74fed04b03c7c6662e7 SHA-1: 91846cd16534f86157b5689f8c4851f355635979 SHA-256: 0d722356672fc47e155404e0a7a602b118312647c43f9995f10e2f5f2282636e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary function of this document seems to be acting as a link farm to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=thermochemical+processing+of+biomass PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fca3a8693---41952797889.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/zijifewut.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/mofedawewakadikudonogomib.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/27caae58c8ca6ef33dc76e0b4aa29e4b/32377701239.pdfIn PDF document text
    • http://jn-zhsc.com/upload/55832741922.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gg5inh0fdalogk1o9oa22pudf1/lusadixawonomoz.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vadop.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085823678903---9754210423.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/nodavujoj.pdfIn PDF document text
    • https://dineflon.com//files/63027876531.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/vewurazujipij.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/46045921064.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/gumajukowenudam.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fmqbtdr0kisj2vf0tpb1ho6t86/40133246686.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/nomilovavoledabiket.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/fowumofota.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e29345277---dinex.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/10881050788.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6396f91a255f184b13120ae7e94ba5c8/govif.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/98443398759.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210601101114.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/womiwut.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/34570547777.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609069c746c00---79340574191.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_off0000c446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC446 17364 bytes
SHA-256: 67a26c7c71c8af4e341f6174ef996abcc76b7edda69e7975b65750e5aa8d4020
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10932 bytes
SHA-256: 6324ef609fdc3b708b7ee6ae157618d30403a4def01806d6173198c5d78c798d

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