Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc526ae873db624…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 10:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90c1a58b5b3900daf28b19b3f3dfa0a2 SHA-1: c86a2cbcb45ee2b82569fa4c7b478cf76aea7dbd SHA-256: 5cc526ae873db624d04f154cda6829555b45f5da23cc09bf06c62f8e094ab511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests tracking for phishing campaigns. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and redirection capabilities.

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://ketchas.ru/uplcv?utm_term=apk+mode+among+us PDF link annotation
    • https://www.iieng.org/editor/ckfinder/userfiles/files/pezapimejugizapasez.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/67058292334.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/gexogawonifa.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/gezamezo.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/15438475246.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/42831888365.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/dukefadigizutuxuz.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c2c456e---97094766060.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/34124372120.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/tilojuxaxotofegisog.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/tuxarunoromiraju.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/gedezotupusitazezi.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/54469333193.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/81138604384.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/33929699808.pdfIn PDF document text
    • https://themalc.org/files/file/xorapejejulugagadoda.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/29207772579.pdfIn PDF document text
    • http://techmechengineers.com/uploads/70849614074.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210911_60A782C8D2DB4833.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/83130298542.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hh2hedv3lnt8gkot9g9a6fe1ej/wobipune.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef08d3a76f---49847898680.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/nasux.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/55358655123.pdfIn PDF document text
    • https://vendax.ro/files/file/vodegaxi.pdfIn PDF document text
    • 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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 20004 bytes
SHA-256: 18ac057a781a93807e2a79a59c1de3dcd7d88f059e0a2912155100be3e7bda20
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 10572 bytes
SHA-256: b0aa741567aa88d8835befb7c73813a10c2cb9cf1dd704000a6e1720cb7d2325

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