Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab548e59abed55de…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 01:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b11d085048075d488e5afc22dc93f4e0 SHA-1: b334f622dd745eabc558244319e1bff2d58133e5 SHA-256: ab548e59abed55dea111211643d327fe10be1d512490ba1e07dc5f95f3dac338
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these redirects. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.euro-fly.eu/userfiles/files/pomuxuwarugulaxad.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/tebamisokivitidiko.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33820534a5---90989431961.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/gm2q5muenfua0av1d0kbt8d2od/fawotevubagi.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f8c1b61546996b4d106ef7171f02193/80043945885.pdf
    • http://renknh.com/ckupload/files/68113785847.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d19f09533d3---86688553546.pdf
    • http://alliusie.com/userfiles/file/niribej.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba13b324c4c---59201319144.pdf
    • http://smit-electronic.hr/upload/datoteke/12650543441.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d36c2b273a7---davalorujusobeluvadekiso.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/27a6745d313b31d292476bd397a0a0d2/minukagamukenudijotimoze.pdf
    • https://vigiweb.cl/dinamicos/files/file/60405202621.pdf
    • http://curry-box-deluxe.de/userfiles/file/setubarodabofakomemeg.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/pagirikam.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/kbm133idv894a15abu3qgej12d/xifikop.pdf
    • http://fixafilm.se/userfiles/file/82047404344.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2553ce1d54---46872981433.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/o12hr2hl6dcj6ilem9kc652bj1/ninajiladirivaparofuf.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f6a94bff1c36c676071aee39071eac71/7757998400.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4fb5660df---zisolusososudiligefos.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/efoep64g901uc7p6hco9erag2h/36793580661.pdf
    • http://bagiez.de/userfiles/file/25959124427.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c9268182---10760380346.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608549b996ab7---rifabelapajebixurezefafe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=early+stage+consumer+venture+capital
    • 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_off00010a76.bin
0d58dc49551b558978557cb8b294db5486bfbc3f058aeecf8c208b0100e1d03c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 17572 bytes
font_01_sfnt_off00013883.bin
53091a2675d333c683e1ba0aefd8dd0174e9e32b4f587dfb9126facb9232f72b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13883 10980 bytes
font_02_sfnt_off00015207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15207 16792 bytes

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