Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05272a2206582f9…

MALICIOUS

PDF

74.8 KB Created: 2021-10-13 01:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1fa9d7db9066586cb1e7acd8d4938e63 SHA-1: 6283abd06269834fa0b343f42997affaedb3bdff SHA-256: f05272a2206582f9c12c780c198c9b6e215d1649990f831fe8b9a4bbe97252ff
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or conduct phishing operations through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://biomisszio.hu/tmp/lusafufusodesovuwun.pdf In PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/13198834796.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/delamoriwumopazamuwaw.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/39009191265.pdfIn PDF document text
    • http://labotinnghia.com/img/files/morafixusubilerulojatil.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/34272701058.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zipow.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/buxomusemofiviro.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7sk0q2es1fc8vtf8k0khc4k24u/vakexogibamopob.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/66007720932.pdfIn PDF document text
    • http://iccarrentals.com/files/file/82715344601.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/5519168566.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/ravelatufobenawogaron.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/zixibu.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/47933131576.pdfIn PDF document text
    • https://linardi.ru/files/file/zegimomo.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/bumavumogobufegetikif.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543a83d69bb---80445972804.pdfIn PDF document text
    • https://kopari.hu/files/file/48479709928.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/31356240273.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910134316.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cdc69009d---61767038462.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/30489815046.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/zekakivasajutisebo.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/68530067307.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=082+country+codePDF 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_off0000c25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 17012 bytes
SHA-256: 92ff5d6bdab99605d5596f4630db37d7a471d5b5c016479d821b034cf70250c5
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 10464 bytes
SHA-256: c8dd6262d8a016f684c8f03a681f48be0ec5039654f83ad371e1bf24a01f3a65

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