Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d68515f0ade8a7b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 05:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9caf6ce256996912fc57b7b8a0778188 SHA-1: 043be65e4d0c2ed2733466bc909b2b905da959d0 SHA-256: 3d68515f0ade8a7b170c0c29265ebe7746b359a8edab43514089bf6766f0c274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=volte+checker+app', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=volte+checker+app PDF link annotation
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9e40f0eabfbbb132c93497e45cd4b77a/71042117603.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/69436187418.pdfIn PDF document text
    • http://preiss.at/upload_files/files/kitanawutagoradulano.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1sam83pugggadflffo45cd2qlv/22136325870.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/kabodapelebaweluzajo.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/71680622120.pdfIn PDF document text
    • http://jfe.hk/userfiles/24662526423.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/pokorosoweda.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/getuletenime.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/84538722874.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/91162940664.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/fobife.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/36934318457.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/wevajawazad.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/54402178773.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/jizub.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/86vhdcvasrrn2fbtj4fr2ll273/54035180679.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/wolasajigoramuz.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/3874136099.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/nobevarurebologirerik.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303fdd79b04---nirot.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a213102c3b---fujofexuven.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/32215763710.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_off0000b639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB639 10168 bytes
SHA-256: 31693bdc6f36c615dca14fc5bf4bcc5b471967fcdbf341671e9fbebe81a8d906
font_01_sfnt_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 17100 bytes
SHA-256: 0fdced3c64b490066c5720f820c1310a259a27775d3cb715aa8772fc85e6e98f