Malicious PDF — malware analysis report

Static analysis result for SHA-256 85196d40eda62cff…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 11:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb059315aebb3046706e4f57676540b8 SHA-1: 314537a7e344f33c9c4c266a272661abbdd12a5e SHA-256: 85196d40eda62cff1560beaf1d16cc3aa482ec9860b0be3ac089eda1d6f25d88
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple heuristics indicating it points to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://happy-land.hu/editor_up/vamusetupebulopazidek.pdf In PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/sisurisifovodaruf.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/timomexovajewokuliseko.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/vilimafat.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/23188354253.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/liximax.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/norojuwoxevomipifemoluk.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/6612611223.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/gokavejametizote.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/rejilofasupinuwubikod.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/3552715998.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9b41d8d27877715a31eb759ec85d1553/30892884641.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/sivilotikisupaduvovuje.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/19424210804.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f3802059f42e847f617700863b65f5e4/vipopedumofekupakasus.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/ledope.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f445265ba---lapewezevunewifugoze.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/mawogudufam.pdfIn PDF document text
    • http://df-2.de/images/daten/file/16265964848.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/jugosazob.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/losatebevakazuwogon.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b17438af9ece5b35995a9d86a55975eb/44633199457.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/37582834627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+law+frederic+bastiat+pdfPDF 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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 17724 bytes
SHA-256: 8ca217e9d7b20a089e8f9166e50480ecea0eef5df8158115f25870afe3cac487
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10680 bytes
SHA-256: 25df8d5a9604044fcde0946fa72c9c238e0214455187edb46b51485c8eb5b036
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1