Malicious PDF — malware analysis report

Static analysis result for SHA-256 834e0a2ff91a3a17…

MALICIOUS

PDF

92.7 KB Created: 2021-09-01 12:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c5de554735ba38bd09f277faa07004c SHA-1: 54d3255c9befd6323ed2d9f0b7441f48abd8643c SHA-256: 834e0a2ff91a3a17dc24645af95d7e1b1554f81afd42cf44d1c3037afa1c0c67
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://inwebjor.ru/uplcv?utm_term=the+last+song+soap2day PDF link annotation
    • http://em-mould.com/ckfinder/userfiles/files/daliju.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070202375273499.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/kemiku.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/bidegukemagusata.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/vs7ga5nbbv5rjl1ladkqt425es/55636669277.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a7a42d457---27869281004.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/sazulow.pdfIn PDF document text
    • https://wecareprogram.org/images/file/71961599064.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/texuvevujituk.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/52444668801.pdfIn PDF document text
    • http://ligneus.hu/upload/file/vujenofafakurogeted.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/dugogobewapunig.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd7f8906f---23497708212.pdfIn PDF document text
    • http://cloverdiamond.com/file/73994124993.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/zupineditalupoloniwet.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/22769727053.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/xesetidukudigur.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/97803817957.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3b84af59---tebapuxopofudo.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/32028981892.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/24797941752.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c274e1b9489---71149055729.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/nezezoxofuturozod.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f3c22af1---28823784837.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/gorilumenigenomuli.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_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 18764 bytes
SHA-256: a624a166691eb95516a1fbadc12cd7ba0b159a4db6d04353644f9bf32a115131
font_01_sfnt_off000134ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D06 10676 bytes
SHA-256: 9b6ff04d5f87c5c05dc936acb5a1b40c1562a44b3889b1b83e41474b424b6d59

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