Malicious PDF — malware analysis report

Static analysis result for SHA-256 8412bb74564e98e2…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 20:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1eaa28181e50ffa13a2a1a16601bdd1 SHA-1: 23bb344166a01db20874bdc846a4a225c1c903c9 SHA-256: 8412bb74564e98e2ee785fbea8fb68701248e7f763dc14cc2723f7575229a8cf
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous external URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://innobiztour.com/FileData/ckfinder/files/20210909_C5A9D11B8DC414AB.pdf In PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/mofalixetinumamaxuwex.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/90881090990.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jorabug.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/71880342880.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xodiwisonap.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161329c7327c69---9019534660.pdfIn PDF document text
    • https://fong-cai.com/upload/files/67510204408.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/fokofopido.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/84674871880.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/weradabinibewijiwisom.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/72929293520.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/49721678393.pdfIn PDF document text
    • https://tivicom.vn/upload/files/18494828662.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/81415062092.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ba43a8829de999516f9d76be74189e48/kegezexarikidavuzidu.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/topegabubijilirazimexiko.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/1182443241.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/75236069002.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mugetawanagakemadiso.pdfIn PDF document text
    • http://scsytech.com/upload/files/85082008343.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210916_75342DEC16C03EDC.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/30c1878f876366d0d11e91729dd997c1/fotibazuwonajarus.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/73460951226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=adobe+acrobat+premium+apk+hackPDF 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_off0000c259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC259 17412 bytes
SHA-256: 3fbfc2bc82fa6045366d7a4953d35eaa900525ecd80b5ef52fe50f402a473a43
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10772 bytes
SHA-256: 4df2144ade534efbdd701898c5e4d12c0c079dae206652713fe9d1955c1a85cc
font_02_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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