Malicious PDF — malware analysis report

Static analysis result for SHA-256 759664175de4c837…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 04:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 094da3ef9782e63ae48175001a9f9649 SHA-1: 9f61bbbae610745a3e6c38e4181b7a703683061e SHA-256: 759664175de4c837d0428c5a9ee579122016c6b55266a56ab3122741e325ab9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3d9c89dd917d48baa8bfe46baa78b445/lejedinumenotinuluf.pdf In PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/xenofugotusajegepikuxibi.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/gopuwopelefujefi.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/71399090056.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/822cc4aa3f1c079504c269e3ece3ce01/nibiwifanisoxujol.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/385d1ae3f0de45d745903516c1f069b8/67675012756.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/44380875589.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/garujimofawolosijeles.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161364ef346bbf---23910523236.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bpoc7jui23rilct1d6p6ntu0nv/nelawurefewademugeluvosem.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/81058784881.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/89473032116.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/lhr3i0vbaceupnpu884k5tg958/vowodowuxumopewodako.pdfIn PDF document text
    • http://sparkpro.lv/content/file/29099896824.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/nuwuvot.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/9492669375.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/ganilogifinakan.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/kiwurekopubajamezu.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/61890372533.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/monixadubipirilogomap.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/zuruguja.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18f190703---sudedoba.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/e08b4abb0551f59541df7ab506d83e01/potiwelisezegumuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=parllar+space+apk+downloadPDF 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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 10496 bytes
SHA-256: 7f41612dd775792fe8191b2fc83545f56be432642484011e57ca3fe06af238ec
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 17232 bytes
SHA-256: 9eddc971a6b6a5dad7954bd18a548de2f9ee2e62e1e90cc777480852dd66d422
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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