Malicious PDF — malware analysis report

Static analysis result for SHA-256 be204236a846189e…

MALICIOUS

PDF

90.9 KB Created: 2021-07-07 04:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f60f3905835bd5d07b0361e7038a441f SHA-1: f06d4b4ab87ee15750f82b7e3123498352a987ad SHA-256: be204236a846189e5e066efa34685836b792c58821af4cbd51ebcc42161a75b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO poisoning or phishing by directing users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fantasymusic.it/userfiles/files/37507086893.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd61914712---zavadodijo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l1r93r43hu34u0vb4g020ko5g6/64692216677.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/20180166500.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d00240b8a---dadefeb.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/kilebimimenovuvogovuji.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/22648248387.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e13b834c6---mevosupumun.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/656fm4v684cbmiglcp9enf1m92/85642338315.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/73016040439.pdfIn PDF document text
    • http://k1a.ru/images/files/file/zanelulejuzojamufufojukel.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609234cf571f6---kobubabumolujororexobeka.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bb395bde519---gewegimiwaxilomudowi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af5b648f611---62579430645.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad730db955---30374336480.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/80848205169.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m7kknhs5craoderqrjdkpqel77/36547053856.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/19785658500.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/80515240546.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/lomowigixofigabupobiwoga.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae318d6b8e0---pekomudafekafaxuzilalanug.pdfIn PDF document text
    • https://loctra.net/userfiles/file/39977459883.pdfIn PDF document text
    • https://jurad.eu/files/file/pumitopibij.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210618110522_ah92c0.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/20369167404.pdfIn PDF document text
    • https://aneri12.cz/res/file/jovolijimujaxirixipixa.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/vorevenaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=class+9+science+work+and+energy+question+answerPDF 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_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 11280 bytes
SHA-256: c8e1882af95abf5beb49f1f46662699696c413ef384c93a257084d9969da128c
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 16776 bytes
SHA-256: 14848cc21e1704e706e930a388f38356175d1decac2a1775b2180d4b32cff7eb
font_02_sfnt_off000145bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1