Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ce2b2beef9b4f9…

MALICIOUS

PDF

101.5 KB Created: 2021-06-28 23:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 84084702ed3b0713ba240afbc09afd92 SHA-1: 401138e40c12a33123952a9bfa8ef7a337e6fb09 SHA-256: a7ce2b2beef9b4f9e24a0d725bc4015cf91ec14eacc32dbee81fea929561128e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the final destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://kirakuramenandsushi.com/uploads/files/wetufuvobidumo.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/naqsnhamavl48otgehvk22ql0a/ritamutizotojelezebe.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k1fqfnp24uagiksa04pbkfgd86/64726150144.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4064cd82---43214513972.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/69j07kghmrrg4s2ecv0j74ikk7/22742371938.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160719684d82f4---81808445555.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f9f3bab807f782de9df64e583d6b6a02/87108321041.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b574e3769e9---norinunusaxasoda.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/fozevonunivekekisive.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7eqpibgruvc0vv59mn7ut6ckl3/75946864544.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/997793877.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///topududapuxifibasu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb261afa19---69960821392.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2jluh0t5rdk961g1vpnjp1d4uc/86554394451.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94a902463---mupimoz.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd852a4fe---kinodiwijelonulemefev.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc22c4b07b---zutanowed.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gukunabajeba.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/voav39s71nn1vjeatmsprf9b3i/wapetituveb.pdfIn PDF document text
    • https://peterdegendt.be/file/32108583353.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/da1909e641de12b1b67c1d23ddf16e80/katebilonazapukulufoge.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/17cl7jn2p23rbcksr8h8vphfiu/mepimalegosorox.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/46255472994.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/fudifamupali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=knee+chest+position+in+cyanotic+spellPDF 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_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 10476 bytes
SHA-256: 09e4711843f2c6bcf35713e8a79ca6d6838082fab2455933d432ed6cde813507
font_01_sfnt_off00014218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14218 18056 bytes
SHA-256: 1518d487b0149d5032f753cde06f05792806fa28c2cca7317dafa3dc8e3d81fa
font_02_sfnt_off000170c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1