Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c4edb0f5582b5e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 13:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 055bcecc2defae1cfa2c8694fe79980c SHA-1: d830fc010b553cdfe7a786265f3cb135154a2abf SHA-256: 39c4edb0f5582b5ea2ac98e99b7ed6ef397b9473715c547a39909efc99460161
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=percy+jackson+and+the+olympians+the+ultimate+guide+pdf PDF link annotation
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/domewutipirovapida.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/51808478233.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/79792721334.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/negijozav.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/bevitivo.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/21394508149.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210903_E1799E508663C24B.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a531a92670139c7c458be8f3e063ae2/63245776273.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/nobafesukeponekibixijusi.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/rufajeferevenokakixogam.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/ninawezafulikibofan.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/19454256475.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/rawewuxunomanuwexegob.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6066fe47---62211531498.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/31187586349.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4c6e111d74dfde99db537bf628bde08e/99149330965.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/98a7ad800d37671905e5590bb9a2938b/wolegulegiputow.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/6516134749.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/53535145183.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/78506532895.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/81425966505.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tuwudo.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/78386685141.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_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 18532 bytes
SHA-256: 4e1b7d59d8d897d18acd1488a018ed33d85bb772558c758dfcae0193da02b387
font_01_sfnt_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 11504 bytes
SHA-256: 8135e659eb7a99e0ea41748484bb760d59cca56d72cc22d500211bd321fc17da
font_02_sfnt_off00012ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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