Malicious PDF — malware analysis report

Static analysis result for SHA-256 0438997a86eee997…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 11:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47c40f6841468691ddee0af3cb72037e SHA-1: 19f8fca5025b7efd12a69717016dc05b5950aca9 SHA-256: 0438997a86eee997e2c5ae28de5505cdc5bae8e0a9c6d491a4ac27e635c97670
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV and ML classifiers strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=how+do+you+make+slime+without+saline+solution PDF link annotation
    • http://brooklynsmokeshops.com/admin/images/file/vuxakekolanebakimokulugut.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/punezijisud.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8d48a0190---namenalag.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae1ce80b5---27664342138.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c2774d03---dipabowetomiwiwudemoduwo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/l9dgtbj5kak4tv2e0u3a5con1v/90783202372.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/32551561203.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607716b30c703---54118026652.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609042863651c---64374702344.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e343ee3c---pupukokuvusozabezexajow.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f3cd66d5---84059510942.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/es54n70qa1t65e2oahb13lf3b5/fagepilejasusivoguk.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/wamakamekalafo.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/tamasafofimagareg.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19c16d854---tazaxenax.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vegenasuna.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/megisopupokob.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lokuru.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/62883961067.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/taibnp2eh1cn2al5gjtgaujao3/2320267792.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/63944635844.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb933a58c1299a6a12ba4130e98e109d/liwejesaludiduwixeju.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_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16848 bytes
SHA-256: d2f7224fb024f433a34349716b88f197fedd713c20772ed88d80d5e9d8fe5585
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 10796 bytes
SHA-256: 100d8185b8f4e62a6ae26ab23e8295eee04289e7d123eda98da4b251974bbc50

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