Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbdafb930701b1e…

MALICIOUS

PDF

91.0 KB Created: 2021-07-15 14:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 813d070c251cf873d76bd983acca650c SHA-1: 0c9df5abd485b34fb233a962ff7fbd9a9a70360a SHA-256: fdbdafb930701b1e88439520f8e152d1ef180e15332501b1fa02afd8668b61be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, likely intended to lure users into clicking malicious links. No scripts were extracted, but the PDF structure and URL patterns are strongly indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://nomylo.ru/uplcv?utm_term=cousins+day+out PDF link annotation
    • http://nova-auto.com/upload/83381747728.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608443c775d58---dekuzimoligavinexib.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/runevul.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1a57bd00---nanenijinofumozakegisugo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2c8cd36f8---zakuzuvuwixivakadatinojuk.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/narasoteferilegawiw.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/36885387443.pdfIn PDF document text
    • http://www.puhito.hu/uploads/74771887597.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/menimowukadugazukagagek.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/gpvlqk6sg6bh33vbvukq32or60/zudotupimo.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/zikodururobidopiri.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab9223759---60709676109.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/zowejadamukedinij.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/tikapibudanadabet.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/karoganezazixoketef.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/59252801054.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ecee45eac52fdd0a2bbe85a9abf600be/pubunuzofibikogozu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/50858785207.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/01d1316476c7702dd23a519088c8bdcd/91198577507.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e034597f70b8b9d063d6a63d39b71697/38923956725.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e07049621c2---xixerenurusonojileli.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/taxudug.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/18625286951.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/39001713303.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/332b1a8c606158c7b1e9d5a90126c225/sunasagururozaz.pdfIn PDF document text
    • http://k1a.ru/images/files/file/6735678522.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_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 10208 bytes
SHA-256: bc9510deee3bd65808bdcd3cfaee37ecc42fb3c89351787d09efee59a3ef39e3
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 16776 bytes
SHA-256: 9fda07a1e2e5befe8593b5ad1355d4662c737d40dce1712fde0954515d6c91d1

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