Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b206b8312c314a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-22 20:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dad85458a3bacf2d6ae75bd96b5fdbe5 SHA-1: 712062fa2a7fad74634499127c2bcf8b171013a7 SHA-256: 88b206b8312c314afc7e91d33805519eef7c225896b0c228a6dc8ddc3b511e2e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected the file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://jeykrishnaclub.com/images/file/vazimedadokekoxuruviwuri.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f93defe71d4b01ba376038d4b1451c2a/vorekefizululij.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/darajujipejivupenukegojo.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/62090209395.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210913_051937.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/dorada.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/31534504293.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d052cd27---80366432839.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mapipinerizokopesav.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/86077488285.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144d85a2f928---tapenanexo.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/75732534633.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/89351449243.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/tumepunaxazekirarimajusiw.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/latiwuzoxofipa.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/90967018248.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/suwovagixalotaz.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161434d6d827d7---9171908421.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/48533335552.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zudebopakuladiru.pdfIn PDF document text
    • http://novichiha.ru/pic/file/50079866187.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/85536620112.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109130419381923.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/rosakepeliserujajizexumes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=synchronizace+google+androidPDF 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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 10632 bytes
SHA-256: 0e775643644fa07f38216bf9a7ea87d5c7f05ce8e39ebc115ca24e53f9cd16aa
font_01_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 18304 bytes
SHA-256: 6a15e056913563550a9f46f8930cf3c1538c7f70cec6381a324eb32565ba82da

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