Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd80277f691228db…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 17:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9667ba0c20bd81df2d682c6f9ae05b42 SHA-1: 019838db7174a578686cd1ecd9971a82c737f10f SHA-256: bd80277f691228dba3f031b3ed71edc0d83457675e9ac19ac18bbad88555c348
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple external URIs and the nature of the links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://motoralbini.it/files/file/25995822276.pdf
    • http://ottuk-e.org/userData/board/file/wotalal.pdf
    • http://draftingfloorplan.com/ckfinder/userfiles/files/bozenaxitetotumizajiraka.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecd23d50b9---wipesodedanidogas.pdf
    • http://labsshop.com/d/files/51935239772.pdf
    • https://excore.hu/ckfinder/userfiles/files/lovidivurunugulifun.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-9/20210909205314153097.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2e7i4jnb6m7lthirg23tetrup5/betuzakaforerofaxelixavu.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pukasajimo.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2jrauu0nq889me2cf1v2cbdj3b/29579090282.pdf
    • https://my-natural-style.net/upload/files/12447868670.pdf
    • http://hitecds.com/userfiles/file/kitirulebizuv.pdf
    • https://mimpishio.com/contents/files/10475393317.pdf
    • http://hoinhikhoavn.com/img/files/32360504998.pdf
    • http://babywagen24.de/userfiles/file/kiturakusatovividez.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/37654690631.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/kofulowuranirot.pdf
    • http://immodraft.de/images/architekten_agentur_images_/file/lunose.pdf
    • http://thepokewave.com/uploads/files/18463110671.pdf
    • http://fobas.cz/userfiles/file/foxoxoripekiva.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bebb205e765f82dc2b8f291d841b940f/ludemofapubezaxetaboga.pdf
    • http://rutka.pl/media/upload/files/700b3de630ac65ea15b0a1a05310ded8.pdf
    • http://german-ex.com/images/blog/file/razazajuzixatujawa.pdf
    • https://futurefacesnyc.com/uploads/file/xuwofopobivexivi.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dccd2b93f---paluzuvilolegezuzuwavaze.pdf
    • http://majortaylorride.info/images/uploaded/file/34164590366.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=solve+by+completing+the+square
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16792 bytes
font_01_sfnt_off0000f450.bin
56d5efd2de2429a811f1fefaccf0f432d3f484aa5cf39743aab4b60862b81a13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 11464 bytes
font_02_sfnt_off00010eac.bin
d00e398e5cb642e31d3c0671c354cec045bcf527c65aaf7215b468856af61428
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 18248 bytes