Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f8cdda8ddf3feb…

MALICIOUS

PDF

135.3 KB Created: 2021-06-28 20:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b98458761c0b804b97846e1f7991386 SHA-1: 59657aca9e9387ec7ee18b5a601f9fd2f96fe5e9 SHA-256: 16f8cdda8ddf3feb1492e599f93054c01722a833315b6875bc7e35c9263d51b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate an attempt to obscure the final destination and potentially track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

Heuristics 6

  • 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 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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ffc8bcc2---dazarusewarelinu.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5aeea4910---31013451375.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b091e4920f1---vaxofuxiwinodenexizobar.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a64a1eaf---43867943804.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/zusonupavuzaw.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/vedunetitojosijoxajez.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160701524886f1---tikulunedukamagimuji.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/sopuziminibu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba38a105f---mapisijokuwojudasoni.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e3fb4cf99---72253713915.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_652505846A84237A.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08d41c67215b49cf84b9401dcb0137e9/15502250560.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/foxijaja.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a677c45d4c2---volexevafo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939a3ee46e9---jesenitixazomitanupamisi.pdfIn PDF document text
    • http://gptools.net/userfiles/file/41972384636.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08de3c583---nuzefisafexet.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f031b3e48---66914326394.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pesewiwuvasi.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/78996111550.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/bedh4fjmvke8cfbvk670j97pv1/21310105501.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zujusez.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/832a4a5b3e2a9738df62458a1f131b71/tidivorabule.pdfIn PDF document text
    • http://apcmagon.com/userfiles/42787991859.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/tujajiloniviniteket.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2af963cf7---80252033528.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160873635c4836---13489109467.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/66436556774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+party+at+kitty+and+stud%27s+onlinePDF 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_off0001aa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA89 19020 bytes
SHA-256: 1f0f17ff51ee63c2e00d5c93e5a8d44d22b0cc415a4e0cf8886e0650d5654507
font_01_sfnt_off0001dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F494 10792 bytes
SHA-256: de76c1e43f1d5f6f97e7a3b55ae7ec8564fa9da3682d2bd9b3ddeb7b20b26d83

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