Malicious PDF — malware analysis report

Static analysis result for SHA-256 9598d870b9170629…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 00:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c706990a6bfe81ddc85f3b6123664651 SHA-1: e5555db7e0d7e4b8056ed7c02a4801378ca3cf96 SHA-256: 9598d870b9170629b5068eda43e67d9f6c07fce0c3f94d8a3ad7c0f5f5fd2ba5
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple domains, some of which appear to be compromised or disposable, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the presence of numerous external links points towards a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://propactionvehiclesuk.tv/userfiles/files/22067287549.pdf In PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/kesogimuzi.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/69377579642.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/90494356852.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/widevinuruzepodefiwiweg.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/gujizotadumamefiwegoli.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/bolokunopavozawuraxuvodi.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/foxukowunevepokezupofe.pdfIn PDF document text
    • http://compsult.net/userfiles/file/gedemo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a60c950b---dewofifikuxeke.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/85984389406.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9952c928d82b272cfc360f1070878705/40777640670.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb30c091be---26192577291.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/55826762859.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/dozavurapuvojututa.pdfIn PDF document text
    • https://ms2oke.com/contents/files/jakarelalolegotugosakovig.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/12d11f310575d4361f02be439a9ec5bb/20901323357.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/roputovepemasog.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/29983872756.pdfIn PDF document text
    • http://kdekdyjak.cz/data/samisafewokakobekalosag.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/79878174359.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/depedusigok.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/20096761676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ppsspp+dragon+ball+z+shin+budokai+5PDF 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_off0000b031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 10968 bytes
SHA-256: 8fd0c2c0527a233da9302c446e7ef70dfc5690ef98e9d3332c1ca6be9700a843
font_01_sfnt_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 15064 bytes
SHA-256: 0790c47684a897c1c8e4d5adf669ae5e4d15068c0185fc7d4a64df2d1647a4dc

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