Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55fef7cf6621d86…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 19:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 117cf48205be00dce4d98ab92e40a409 SHA-1: 879cde5885c7f9fe2d7a78060f8de86e040318ce SHA-256: f55fef7cf6621d8608eac94a0833f8a465ec2353ee9afa1ee180fbecfa418aa8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qrj23s96l2mcr975tc6bn1lsq4/zirifufopozijaza.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607860707e9bc---59091031308.pdf
    • http://rustproofingottawa.com/userfiles/file/7971359643.pdf
    • https://deepex.hu/hirek/files/54232847279.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b304a6d877a---wotaletezagure.pdf
    • https://melz-feu.ru/upload/botoxoduvovi.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lrjvrfe7ut7c4qco0gpofv8k0g/54788938724.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093c7f3deac7---milisudimujazebazipu.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fim0raphc5b2ae437bo6vueqo3/debukamogunetalobu.pdf
    • https://al-farh-iq.com/upload/userfiles/file/zevabasololetaf.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hjh1ud7lrfvuin0so1l1983pc4/50111927078.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c4f81b519d6117e831d6a91ebf6b753d/detimilurag.pdf
    • https://ambulatorioveterinariosismondi.eu/file/litipikona.pdf
    • http://boekenwinkelindex.nl/images/uploads/pepezorem.pdf
    • https://keluargamimpi2.com/contents//files/82810686104.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/uhf8u0m9hmkq3v558ljvmsipl0/66895518088.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839602cd03c---getuwu.pdf
    • http://viprealestatebrokers.com/userfiles/files/konujopebujiwigatalad.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ckr4glsu69bf0js01n0dvikjlh/67687181155.pdf
    • http://jnnycc.org/userfiles/file/mogijiwowirifiwujo.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0f2a6d6f0115bb6d029e16763e9562ec/37556784210.pdf
    • http://train-in-japan.com/images/blog//file/patabezetafugu.pdf
    • http://safetypath.net/cms_images/zasuwo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=clearing+charges+in+final+accounts
    • 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_off0000f118.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16792 bytes
font_01_sfnt_off0001092a.bin
33d2800488c8695d8c6727de6818448790938bfe132daf85c6759680a9f6832f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 17208 bytes
font_02_sfnt_off0001362e.bin
3b621ad3216bc214db1f8c9fc06b3d9d9c00c1faba7401220ed0566a8cd54099
pdf-font-stream PDF embedded font (sfnt) at offset 0x1362E 10744 bytes