Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfde39719c2e30e6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 06:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2b7cc69f97329c912ad48a62891c85a SHA-1: 2422ad7a5dbaade62e1175a6f7cc5c06b8f2cb47 SHA-256: bfde39719c2e30e6b57656295ff49011d679bd1efaca065d48c72da69705aecc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, one of which is specifically crafted to lure users with a fake offer for IDM software. The presence of numerous links on compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution scheme.

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://drafthe.ru/uplcv?utm_term=idm+for+free+download+with+license+key PDF link annotation
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5ml2tmllmts09n4v2kknobctqv/51633783671.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/rufinukixumebatofus.pdfIn PDF document text
    • https://uudanbury.life/files/file/9964664422.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/62782719172.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/likiginaludivuwekeduxem.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439ce60ab7---zafakubeto.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/dipivinujazejosuk.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5e665bea58bac91a1183ff629d952511/7547535269.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147bedf919d7---88551092713.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/9077679339.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/sogajijilelasifelupasofoj.pdfIn PDF document text
    • http://magnanelli.com/userfiles/file/67982898574.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/74559533039.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/44387643402.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/jelunofajilafewewiligivum.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/82201483093.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/43051571221.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/72044810433.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161348a0eebe85---ratosisoxagazozo.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/22133332228.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/89208309250.pdfIn PDF document text
    • http://sushibelovo.ru/files/duwunupaboxozaxokur.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/xugililirufokanen.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_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 10984 bytes
SHA-256: d70f68296ba421065b9a139d2b8767d9cd87b03a0dd22a46296f413afed7e29f
font_01_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 17512 bytes
SHA-256: 82b550f10f3f913f185f3048dd8b61a9949fa2f46a59cc45e80eb7efb7d52a02

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