Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e825886c589d96…

MALICIOUS

PDF

105.2 KB Created: 2021-07-23 07:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2e358dcaf85846c246b2bea8e8a06440 SHA-1: 96417463b38b2475a8475b848b4383f0c996dd2c SHA-256: c3e825886c589d9610597c9a022d5b752d4c1dffd8e150e7ead1f076f507127a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially malicious or compromised sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dellalontra.it/userfiles/files/98041871923.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e5de9d46---71319312183.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ba283ea58b1e0d421704dcfa2b7d2fce/lefibat.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/99942336507.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3dc9f7ec0fc7eab67e2cfdaa936b614d/26375939569.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0qgk2rol26kfghbuuih53d2eeg/jariditasimijijapeguro.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5ba3fe2d38e1b303b555bbb9b3bd6f2b/46725703993.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/jamozur.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/86912546200.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ac09b7eb1c28755811f644b12e1183fe/duwatemerimatebeti.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/78576909183.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/dibumes.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/g9ag700kosl534vml5tatg1gv0/kakivilefukudawurunuw.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160900ec67b7a1---31304263737.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0a969084c9ce26726244f678e3123312/jelaxase.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/79375113733.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8082376bc---sekebodufasenagevenumu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084146c38d65---jimisizavadusovomex.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sukimobigukedamuto.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7008202a1---28119940424.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/wikanit.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/53833098699.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c700643765b---39557107767.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g8jsubk3782iomo9n3blab7ia0/vorowutiwowagagomubo.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/ralixanowopawid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+hack+a+protected+pdf+filePDF 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_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 10612 bytes
SHA-256: ff84693c6c9a8406e267b34ef637b8116593b1e613939753c060ee3d14856801
font_01_sfnt_off00014cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEE 18648 bytes
SHA-256: 9b7b4525b1d67e546aeda96d3add9549e93d6e6fa695dd61d3917dfb5c1ef1bf
font_02_sfnt_off00017e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1