Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecd808e6b91148b…

MALICIOUS

PDF

70.9 KB Created: 2021-08-28 02:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e202464c258185103b74f62745e03363 SHA-1: 08669bddb4a25ee3b6072e694f133054adfd0f68 SHA-256: 7ecd808e6b91148b4986cf62f1348aa94503f52a25e3d57410336d7436fa363e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised content. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, possibly for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=contax+st+manual PDF link annotation
    • http://harasim.cz/uploaded/files/62017344602.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210828_1120A286F3CF0EE7.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/48069625950.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/76184251372.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fbd0b1bad---91655048661.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071b17967900---46213650256.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///64595951467.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/76737551727.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/nuferog.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/05ea1207d276f4fb69d471ee6c2f3f04/7626858970.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/68628787172.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/dosamiwunitolezuxu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/98238624826.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132b6c92ec---89397946621.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/68278145959.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a401c8f68---41365677268.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/24037764424.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/nirobikofiku.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/42233791002.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/035bc687c75729d9ea3f0095d571ca0f/xobunige.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be0235967c---79254904367.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070865b5ea17---49178564501.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3f205cf4---xazojevuwoxuvolup.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609463ddaa42a---gatirerobalubewadejaxi.pdfIn PDF document text
    • 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_off0000b8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B4 15272 bytes
SHA-256: 823c533b6cd24c8bcb77577df5a5d7d7f20c3f13fb2f4c801bf44e3baae93b0e
font_02_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10180 bytes
SHA-256: 62311a82c82388befbb744589dd327e3f13f01fdca2c8247cbfed0b2eedf23a6

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