Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36d189219ecada8…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 14:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 723e5cb290cecb639a8cc70b49112364 SHA-1: e19966374ce57070e82e523697914f8c79fe789d SHA-256: b36d189219ecada8174139c5fa7fc12ee397f138c3699c7c361f3401d59db7e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://davaocarrental.com/images/file/labiwimexufenofixuvi.pdf In PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/93221729361.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/saluj.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161455de30b2b7---75910693223.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/28181067636.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/59193485654.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-20/20210920022225487031.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/99973463519.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/81691021210.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56448980f---154871232.pdfIn PDF document text
    • http://mosjob.ru/images/file/xemofagezikonibise.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/gasuderi.pdfIn PDF document text
    • https://atl-50.com/files/file/79016874532.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/mijudunikomifozabe.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/buzikiraxibesopimikopa.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161484ccd5deb3---11299854833.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kabimawonanikoduna.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/76519360147.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/31433700615.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/83595762699.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/wafuliroto.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/puzakujizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+ice+age+online+free+streamPDF 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_off0000ad0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0F 10776 bytes
SHA-256: d332d5fa297e672d04b5fdbdeb07088b86c8156dc85f0e85024d8103a40fb129
font_01_sfnt_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 15528 bytes
SHA-256: cfcacec3eb7d274f353f3ccacbaea97ef8efcc56c0b19593adc16c5ab8f722f7
font_02_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1