Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aed8c75a72f7a56…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 15:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff1488ff5aa4af71de3f87f517b14301 SHA-1: e5b9f892126c002b256e9bade732533a10e6d15e SHA-256: 7aed8c75a72f7a5646ac42fb2d3f40a2c6d2b685c79c73b2ecd9c0e9bbdef372
156 Risk Score

Malware Insights

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

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://detmers-kontejner.hr/files/62176988321.pdf In PDF document text
    • http://kiddeefire.com/media/userfiles/files/fejeminamavujosakagip.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70df44237---jimidumimimolatobi.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/luvanukokev.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/je5t4nquotch485f9gknodo5v6/66442713891.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/71906188725.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/58572556122.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139d52770fad---18341011606.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/5620133725.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/86152899733.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109102253273434.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/juvafekedetudanabu.pdfIn PDF document text
    • https://csn-alliance.com/data/files/12720470010.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/43476873513.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210911081859.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rigon.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kesedaxevopezufomonok.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/pipazimoxubegusubebi.pdfIn PDF document text
    • https://breedlife.com/upload/files/wanevujededitub.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8f3209e35430e01a1bed11d6e1aead4e/83856133116.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/sazawixi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/91618341760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=see+sim+card+number+androidPDF 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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 10700 bytes
SHA-256: b9b29852427ae9a354d460d39186bad0b6bfe3e4d46d3ca25a91afbeafafe1ee
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 16992 bytes
SHA-256: 36c74b260d6440f189a1b49db0ca435756383602ab335b7bfb6d31db758239be