Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa24f95c8cd05c8…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 18:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a99fc6e89f5f66e08701f79c9ce73ad6 SHA-1: 9556a8fbf229c63edb9b00ccc21df533a52cd42f SHA-256: afa24f95c8cd05c8c389fe9ccf01d92a3766b6cac4eccb14b3c089b710c2037c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution scheme.

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://krisoc.ru/uplcv?utm_term=how+to+install+google+play+services+on+android+tablet PDF link annotation
    • http://laptopcuhaiphong.vn/upload/files/81631218446.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/gukedonigodibidu.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/68518988447.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/zipapefubimorejalovitif.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/xituvubakod.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145532ed86fa---simekuxi.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/jozofibuzolojafov.pdfIn PDF document text
    • http://insei.eu/userfiles/files/zavogamulerib.pdfIn PDF document text
    • http://imi.vc/upload/files/61926010482.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9948216f---rixita.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/47100373887.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/foxato.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/25137071437.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/98152574072.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/pajuvijuridavazenuvewutek.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382ea45ce0c---togodan.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/28308982787.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jobokegilibede.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/95504284825.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/15394445239.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/murujawemawozaxasedabi.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/roxotizudodunimiwul.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/69826290080.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/47233726853.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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 18480 bytes
SHA-256: f91268147e0c217ada989b5c81ac0663cc83a4716c763b2094a31fa38d194af5
font_01_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 11088 bytes
SHA-256: d4163302d14a6c6be52597235c2991e5c1ae10ffd8113d8143d7efaf8304793b

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