Malicious PDF — malware analysis report

Static analysis result for SHA-256 19efacd7549062e6…

MALICIOUS

PDF

85.1 KB Created: 2021-08-17 22:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0666d7f39b06f8c768491dca7aafe407 SHA-1: 4e9fc300c9f78550fce07aef94675722af5aa477 SHA-256: 19efacd7549062e6eac083c96af0f8618137cbf84f991736697c766473cb91ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=how+to+get+xfinity+app+on+sony+smart+tv
    • https://mszukam.pl/dat//file/nagetisamesulasegusase.pdf
    • http://siltherm.com/ckfinder/userfiles/files/88209390525.pdf
    • https://samngaimarble.com/html_upload/file/47295646408.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd4378492---modileregapo.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/85100af304b4e410de924db95ffbc128/7098392807.pdf
    • http://kingtonkatsu.com/uploads/files/motevugoxigitif.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd83cf0af8d---kokidabuzitijig.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a08465c5---xagijofesanisa.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa7ea98ba6---fovibapugusuzojofe.pdf
    • http://barcabianca.eu/upload/file/30453981355.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/nadapakiwosegefatevilupo.pdf
    • http://thrifty-uy.com/files/others/57013125202.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ed0ed34b753c13b34193191f0d1b6c00/33329160921.pdf
    • http://webhenevents.com/clients/868374/File/31264354627.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/42792237903.pdf
    • http://arohitourandtravels.com/userfiles/file/vatelidutufibazuzusasodi.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160895db5e0e4d---74042503398.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/s0ssi8p1ajvo58lpglj55ahpjd/9823036748.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8bl1823r7qkosoan48qv63j4ke/68559150501.pdf
    • http://geteffective.biz/uploadfiles/file/85405993012.pdf
    • http://baigeleather.com/userfiles/file/16289598842.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6cf6837b913a70730fc5ed1f5b36eac1/doxanabozisolidovo.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608002d4b1594---64169798527.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c549ef412ef2e5271f38c479a9fc53d1/45627004863.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325093f941---zogitabapu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 16792 bytes
font_01_sfnt_off000100a6.bin
60e8064b9cd70441503b5e446bd4dca4835c97a37e0952cd0ec2790c904974cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 11012 bytes
font_02_sfnt_off00011a4e.bin
6a3bcb543827b18af529ec453abba5aecbe7035b2a3cc0dbc6cf918dcbfefd01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 16844 bytes