Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fa4e90759744e3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 20:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac484e77eb9f080d0584d5a692cd7079 SHA-1: cc7603677f3276ac639a8d6aaa264d5cd4002006 SHA-256: 25fa4e90759744e3e10b45373933ef213fca1725649a6ddf7ce4a2f39c1d7306
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites hosting PDF files. This suggests a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2216df93e---25743103653.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b025bef9d---50431865599.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa6c45c36---35824103301.pdfIn PDF document text
    • http://trovas.com/userimages/kojikawim.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/32127215846.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/95546200698.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/tapisudakifabag.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/diroki.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089a00cd7302---wutajikipivupelulev.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/72409399221.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/39082867530.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0p232kd3mdqm6o9057dv40ddp1/fovotixubo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce8f419d2---wumokimedofumerepebuzujo.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/sadodumabunatalur.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/gufaxuzodele.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/nofokoxoroziki.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be41a56442a---runedevudopabupexomowi.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210702161831_t328p2.pdfIn PDF document text
    • https://adci.vn/data/upload/file/sopoxolatabewukoxotox.pdfIn PDF document text
    • https://artenika.pl/fck/file/6556149044.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/gizuraluxigotumigewif.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/nevisulodagek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=speakout+elementary+podcast+unit+4+pdfPDF 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_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 11240 bytes
SHA-256: 380ed3e9000a2c0f0421cca0dfe5e105841adb851734e71be44e932fc5a94217
font_01_sfnt_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 17456 bytes
SHA-256: 6aaa315d6115114a34132fa5009e5eed24ef8175872b9236da22a7da01278f43
font_02_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1