Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dff133d264a4ce6…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 23:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e96145c5bc403a666bd9024a0bb8a6de SHA-1: 6863682cfc3b1b6443ec12e69c39dbb268d81a70 SHA-256: 3dff133d264a4ce69b01585657359a996b18d230f46739408a12c35fff8da451
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains, many of which are flagged as suspicious or unknown. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://basisnomor.com/contents/files/wuzejoturisexanebefoxesa.pdf In PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/59177888159.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/76387973723.pdfIn PDF document text
    • http://traviet36.com/upload/files/61842948799.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/63990745299.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/jinojotomaf.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/danad.pdfIn PDF document text
    • https://yellowstonewildlife.com/69907470858.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/6500918117.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/16882603213.pdfIn PDF document text
    • http://momsystem.ru/public/file/24825207990.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/5672408394.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/bewepufe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9f872edc---93113850957.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/xikuzop.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/moxizagoruj.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/83553322777.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/jowesivovebejilijuj.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301877d9ae9---34045139963.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138865f8f5b2---nisinifeg.pdfIn PDF document text
    • http://domainecomps.com/documents/files/58633253385.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/vixopewaforuwatodan.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090811574973499.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/bimor.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/73796973124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=oliver+twist+pdf+download+freePDF 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_off0000bb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 10668 bytes
SHA-256: 3aeef35fd5a561ff6494beb2303bd45741feb173754d7ea592daffa8353b1937
font_01_sfnt_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 16320 bytes
SHA-256: 97f15db76ff47b1b77d01497e5b3f7a99252b871c9c699de42f38632fc76a987
font_02_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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