Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3e9ed0db3ddbf2…

MALICIOUS

PDF

86.3 KB Created: 2021-08-03 16:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c679089da981bd8c7c967c50a2ac5ac SHA-1: bfc339daa6e1e9312f4cfa9db44e68ee1b68ba71 SHA-256: 3f3e9ed0db3ddbf2b7842970d6e5a555e32d2bb944a66af36ff4cc1260f1513f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://clove7.com/userfiles/file/13023294652.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ds2kjp4a3nd60n5p0c7vnh2u88/77179079514.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/lamituna.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf226eb8161---22450080804.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/dasojofozokabifanexexisa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df262c6f42---27189886341.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce078bd72e---61404262379.pdfIn PDF document text
    • http://stattus.com/assets/file/getuwanowurotuz.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/76752986612.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/mibezufiwizamemedasonovat.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e93df8ca---37421337533.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wesinawatajubex.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2himo83ikctoaiqghu5pi05jf6/fanumisivagutip.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f551e6161fdbb3128ef6c776e54acb0a/gomisajavegoragoze.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/zumizugeroduranabila.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/gamorazadegixesavovurubok.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/22953323152.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/newafononadujefazo.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107200920308232.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fudkhps8bfjbre2k2osuojm672/taruze.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/271bd63a356c5579cca392f6b88032fe/62185965010.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ponosus.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/19943263982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=are+tribute+summons+special+summonsPDF 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_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 16468 bytes
SHA-256: c578889259b91561ccb40f6720254aaab73fc32576033f6dbfff8aa65a9e82b2
font_02_sfnt_off000131e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E8 10756 bytes
SHA-256: fe2aeae33b1f7886c4b258db2b4e6d7d21428ed6dc06c8d0678119b9134681c8

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