Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdb6bbf3d829a50…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 23:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5f29117ee120a9ee1290259c6977476 SHA-1: 6c928058b270d17aea2b64eecb1f9eccec945cfb SHA-256: 9fdb6bbf3d829a50b1946d8f1a19a9f512754e0f17de12897248352c08c9b67a
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate these redirects, hence the inclusion of T1059.007. The primary attack pattern involves luring users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=how+to+remove+screen+lock+in+redmi PDF link annotation
    • http://cheliabinsk.realxenon.ru/uploads/files/vebidokuvojixepow.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/15863301133.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/88431858546.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/figagukezafivuvetixi.pdfIn PDF document text
    • http://wych123.com/upload/files/95870194413.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rokejatopidigaduxeda.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/nevolidideninigezata.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/30482554731.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/79242576339.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bc1dfc653eed0f9354cf1860ce85199/zotaxeguzoweva.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/ketibavafobesuseborezamuf.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/44163266946.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349f983d82f---53400876595.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/52272805708.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/120944411197.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310ea96f7d1---bikaranibum.pdfIn PDF document text
    • http://ccadl.com/files/20210910020149.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/61708374602.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/68277402664.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909022334.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/56004556496.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/44032103008.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/xuziwibedatuki.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_off0000c024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 16896 bytes
SHA-256: 239c0a333e62e765115df380f54690de53205fc9b7f9b3e438ac4d0f77469df2
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 10604 bytes
SHA-256: c35b86d59cc82f4a04e28c0bc820a2cc3d09a4cb62145b89a94b42f8e0b5eedd

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