Malicious PDF — malware analysis report

Static analysis result for SHA-256 232b2b1d0b328f1c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 11:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 177cb61679aa088da3cc0c5d12bbc1c8 SHA-1: 435540139738d05a8c0e2c08adc2da22c2c5c211 SHA-256: 232b2b1d0b328f1c4779b9afa7700d61c41bea76a28f7643c545547aee99165f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://developmentassociationofnagaland.org/nbloom/fckuploads/file/13396935890.pdf In PDF document text
    • https://pet-fashion.ro/mm/file/96981682507.pdfIn PDF document text
    • https://people11people.gr/uploads/File/nupefofo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/taregivewezikojuma.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/903621a980f768f6e3e4ed9d8ca3b196/lazipinifu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22f0c5ae6---68497168231.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/tujogeguvokowazikol.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13a083e6e---vuwujinefesami.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed1d36801---54560497822.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/81341467011.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lorj9202f257phlfok85p7mn33/61161631904.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/povaparujerojimoxufekutu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0b1ae28e4b92420304e6c6d9776f7afa/39522191988.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/zawagotorugowejokiloxar.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/fexupisi.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/56666935803.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112a52152f43---72212472117.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/17410670878.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/potebip.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/lovezamikun.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052722472273499.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/dovujitogoke.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/getowovixu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6cf043513ede184a5c4c7452e998e3fa/gaxuvedukaburotagejopufeb.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/fobexetisad.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078819b1f558---21434245482.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/86474628230.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/dovogupojerupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=japanese+learning+book+pdf+free+downloadPDF 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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 19684 bytes
SHA-256: 208673b25d646239be79713d5603ed5c9a9044c6a00d9a9c390a0d874aadf6c3
font_01_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 10884 bytes
SHA-256: 8bf9b8398b67fac426e20c45317b672c28aed6ddb82626409f76e26b5cdaafb6

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