Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec24484545dd952…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 16:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c4850fe301ad7e0e1859e14233f8645 SHA-1: 8287bfbbe821325c6273221a400d66ec0f1fb22d SHA-256: cec24484545dd9524a1504d23cd07be97fc3a9ed42aa7985e329d020a24eb145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and other PDF files, suggesting it's part of a link farm designed to manipulate search engine results or distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oncallanatomist.org/ckfinder/userfiles/files/46762911483.pdf In PDF document text
    • http://gtshotel.it/images/file/netegorarof.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076550bddb97---90094779131.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0665985e82---51000271226.pdfIn PDF document text
    • http://prosquash.by/data/71504482784.pdfIn PDF document text
    • http://cortabellanews.com/userimages/7237450143.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/pefoxavifom.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f6030abc---14569551061.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///73685432576.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3460bbde28---82325907312.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/jepevovugasajavefiwali.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39f7d4a433e779a56c43aa86af9decfc/40445319371.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3c1a7e359e466ce8fdf367446a6686a9/refokufevit.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/81789425655.pdfIn PDF document text
    • https://grandegroup.net/files/60916292789.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/tavoradikufokajo.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/tovudoti.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073743240209---10491876634.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf73eab7d---kojojux.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/sorikerimamorewajazapigu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713bba1114---47650697977.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/82313455118.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/titoxexo.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/38167548222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=aqa+sociology+a+level+book+1+pdfPDF 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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 18452 bytes
SHA-256: de7a32d460b88fccce5ca670cbcaa3ad2dd90b393278a0b60bada38cbbc4127c
font_01_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 11084 bytes
SHA-256: f90d710795686253b8dafa33113caeb6dfb348e197dafb4eb2ac993d3d7c2a6e
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1