Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e522460f76eb97…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 17:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28c160c881bc142c203975682be6c16f SHA-1: eedf3720f90a7ef499319e28f281a8a6bdbec190 SHA-256: a1e522460f76eb97bb324c00309284fea9a4ed20e32715deb44b5e1c0cd07158
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mcsfood.com/images/file/44592151728.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8c0de999---7347842781.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a3955c7f24b6b387612edcbd297d401a/taxeton.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/97875070611.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/58785458186.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/koderuvogeba.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/15241103761.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/guxinuwosoraguta.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/83553322777.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/37716952072.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/27686181965.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/54005995593.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/74684659764.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/24137027422.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/38722909284.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/xinawadisirovutopoladu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f9f583cf---gilozixuzuxilan.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/61689903958.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/xujazew.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/82182112066.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/47535272218.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/33430045760.pdfIn PDF document text
    • https://tsolisp.com/files/file/32795086798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+take+screenshot+of+whole+page+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_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 18012 bytes
SHA-256: 8749df0b319d0feb2f2a45a58a498aed1a0a461df41b80c8dc894a891d38e269
font_01_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 11068 bytes
SHA-256: 7b11733b821b6186dd338acd740c7cbf8f3e8329c1b5791c3ee1291a84485b8e
font_02_sfnt_off00012a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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