Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b90c4d0c498829…

MALICIOUS

PDF

91.1 KB Created: 2021-08-17 07:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c951de49524b96379d4f7b3625e834f3 SHA-1: 1b2d03c89e4d156533e7ebec42e5ed729d7402e9 SHA-256: 08b90c4d0c498829f200ca7891e212fcef82475c912b6690136a17c660418571
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 CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760c74793e4---xumuw.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41c0c9abc6---rarewegedijugilotuluwan.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/wusoxez.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/pajelawumodaj.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/70751960767.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/45869046960.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/fenevukaj.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/4832134785.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160897623ae116---52624083377.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xalabomeziregepog.pdfIn PDF document text
    • https://wrd13.com/force/file/bozipenafelasu.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/mudut.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/110fba88a3e66c135ca9768915ee9d44/napebutulupun.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4cb638fd3fd0ef5e68dfe82109a5e5c0/tofapi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/64268692642.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/vojegefadapomurapuxukax.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/65217597054.pdfIn PDF document text
    • http://emannsltd.com/userfiles/87806772383.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161061d6826687---72384357560.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/xenedelajiluvip.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/gaxikos.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608723f0a4da3---demejilagujaloropu.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/tekoxejetadibupuxonipap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tesco+anti-bacterial+cleaner+spray+500ml+safety+data+sheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 21208 bytes
SHA-256: e9baf26316f8413a89ea00e85b50792564050a0e2dbdac0f881a596d3bd03855
font_01_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 11392 bytes
SHA-256: c486b3c4dc51c83cedf190f935f057fa107622b777f61d6a8a3e8aa7189afdc4
font_02_sfnt_off00013bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15403 1884 bytes
SHA-256: dbd79c33beddac60b582d078a3d104d4afacf58bc8a3a73de3fe63aa5d3b028e

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