Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f04c0a82ed851…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 20:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5344685b77819450a6ff29210a9a7375 SHA-1: f398e842e0f6a6f9dbdc208451ccb26ba9331dd7 SHA-256: f24f04c0a82ed8515d27b436df79d5f1ea34672ab56d188904123cc3d4d8b2c5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains, likely intended to lure users to phishing or malware distribution sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137579d001f6---zukotikanajatama.pdf In PDF document text
    • http://share-world.tw/userfiles/file/jefosisepajupamixujutuvu.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/tikategezuzilogilaweluw.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/gutivas.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/44091087951.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/24231093238.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fowemaxidixedojanok.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/xesojuridivejulev.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/27321817892.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/35939833351.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/41207497023.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wizisobojudidilezunivi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eca555141---59647302417.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/40269919889.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/84823538459.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca687a799---65139714122.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/litinapugosur.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/fuzojovevaxotegorame.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d50b719e47---87931633283.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/99812777596.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/14559899793.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/risiz.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/62122667447.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/24154867971.pdfIn PDF document text
    • http://winso.tw/userfiles/file/81783245878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+lower+resolution+of+photo+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_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 10772 bytes
SHA-256: 22b3a9d74ed04c08cb2888a0053fa0239643109999d2b55d509ef053cb7a3126
font_02_sfnt_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 16384 bytes
SHA-256: dbe753c7f1a358b0e35a882e44bc54279731cd22fed006d5fece8df20e0dfa21

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