Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b6dd9cc62ebf68…

MALICIOUS

PDF

77.6 KB Created: 2021-07-23 12:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9cfe3b6dc4a2f3c3aec1afb8ad30bf8 SHA-1: 2a37794599bc0ac102335cec56fbe5de0d8a580d SHA-256: 60b6dd9cc62ebf684eaa52f4dc27c72d45afc2ebff7ead794e6504492f46a683
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, which are characteristic of link farms used to distribute malware or phish for credentials. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://aradmissions.com/ci/userfiles/files/rotewivataxus.pdf In PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ae47c0cd---lorugonumujagez.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/331164e7002dc5ac208d599cbf85d8e6/poxedugip.pdfIn PDF document text
    • http://3sdent.com/upload/files/kipofagosefasos.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/mufizofi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19d68a355---68818001949.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7fc6f45c9bfde6db40d06a73b64f9889/lavuzosijutenu.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/28963931926.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/edbacba356128f5442236e1475200aa6/47176768635.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/tazukesasivo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ha3sa0ru8f9s58ha54b0e5t32j/lijoxif.pdfIn PDF document text
    • https://landi-bg.com/images/file/43837203325.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ef530b04580f5516f5a2ff89e7925ad8/latuzofobasuloxupaziruxu.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/70967133819.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/dawozefu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9047f6c1859223702c5997ea8ee4afa6/14721296439.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e2cd3d3f75bc202bcdde7c00fd509b3f/komugegige.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/avhm9l75golv9n2co5q93on8bo/begas.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/28447545195.pdfIn PDF document text
    • http://poorclarescork.ie/images/wanofaxefuvu.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/vomoxosozevupirog.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/18064379833.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a024315fc---xitatapaguja.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b89cade4fa9---gugutilek.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/vekebafuzimesolaf.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/64132000257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=exclamation+of+joyPDF 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_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 16524 bytes
SHA-256: b357f03d9d5bb9b0083c07cc4ee0def8a0fe6ec4741e4dd2e670a7d2e6531e57
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 10424 bytes
SHA-256: 8bef919a124653589a8d0986b7eac012c89b10990972fbd5bdb88d0ed6bbd3b1

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