Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e327c01e80fd798…

MALICIOUS

PDF

93.6 KB Created: 2021-09-18 02:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc94713003280720119dc11b3dee8f05 SHA-1: 26249f5b872786363cf688a0716c5fa32e3c5a27 SHA-256: 3e327c01e80fd7987aff89d9932d0a532b586ee64660be5a70a6060696cf9ee1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of a link farm is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://nwhouse.ru/uploads/file/kulemufawosojinolasuzifi.pdf In PDF document text
    • http://synhbio.com/upload/files/68146774871.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/gifosa.pdfIn PDF document text
    • https://redac.ch/upload/71851117808.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c2d0691ed---32705513557.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/figapusigobo.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/50462298637.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130dff5557de---gadimiteju.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad87b51ca---zarofujeponejejemu.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/64377099428.pdfIn PDF document text
    • http://koutingchina.com/upload/files/39779800887.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/70997851523.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/2806340789.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/pinomumakosobo.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/70343398169.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/41eb7c1281b50ee18d2342e7cf27e230/gelunajomij.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/galurupegoxitusesawidaje.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/bugubewegunode.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/wijizune.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/virulerazizalekigasawod.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/wobakenukekuliduporewisi.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/42390764142.pdfIn PDF document text
    • http://mlead.net/images/e/file/dirifoz.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/tituv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nba+20+locker+codesPDF 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_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 10520 bytes
SHA-256: 0a127b6717239df77d5ed98eecd1f9ffdb12e688234d6da91cbb28ce0281e8e8
font_01_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 17612 bytes
SHA-256: f47754c9810cd93fecaa2358766b1b832bb2ae3a5aa3f68608d1eaa0dab957a5
font_02_sfnt_off00015134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1