Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ac4951616a5b3c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 15:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 929c464874b688981f49fb75b7e937d9 SHA-1: 100d06e3c4230f47a03c1b9e9a002538e952dfa7 SHA-256: 05ac4951616a5b3cdba58a6e172ce6f65dcb417c58ff4258986464cbbc5bcd35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF viewers or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=renault+twingo+1993+user+manual PDF link annotation
    • http://thsport.dk/ckfinder/userfiles/files/kilebatuzirevofugi.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/rirawafiwa.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/giborifosozafu.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/rewudu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6803bed0---jazowu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e91545b2---nasimogijurij.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/96183721890.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5ca0b66e---74095003045.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/58028241475.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/xujozixosorape.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/822e5a0ac205b2f52d7f10235ceeea38/50777408744.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/zukukeputipeba.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a09048bc7---bumeze.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/62047610745.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/zexixita.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876521c7c79---wozodefabevugulijoxoxij.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/vuwutinuvefepikisukajazo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/55f70ce718485a8d86c7f5253f9bb53d/37642703873.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16115fceea61d6---8429167355.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ms2q4bg83bpqa2js5qgcc86b9s/80712407370.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2fc748364339afd4eff949ac0c8735b4/7021754370.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/83202866399.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8af1f202e---kubefasevawiw.pdfIn PDF document text
    • http://nessium.net/userfiles/file/xopoluje.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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 18260 bytes
SHA-256: 0d07aed9a31ebd3952b8adcf6602affb17a0c1de89eae8e06ad04dfa3c8ed5ed
font_02_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 11072 bytes
SHA-256: ed40f403a6fd00e2bdc2fccf89c0c3ec0f245df48b0ac2385d22eb9faf0818ed

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