Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9ad37b1878b086…

MALICIOUS

PDF

87.3 KB Created: 2021-09-22 21:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 307083bf3cc45f99bc97e798590790fb SHA-1: 4d0f5faf9349dfa31cba7e61aff04e8f11b8bdba SHA-256: 2a9ad37b1878b086386abfb0e1570d3ef0ddfc7c83e19538b8bd057be88662e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://dienhoanghean.com/upload/ck/files/sasifafaduxaw.pdf In PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56516837647.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/9249690041.pdfIn PDF document text
    • https://salwangurugram.com/files/11748133832.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/8406110444.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/lotogo.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/97313705058.pdfIn PDF document text
    • http://homeopathyhk.com/files/1217975845.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/47646522705.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/mowoji.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/17929979886.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/47dtl0imeceb5j92guiej4hah8/5995009505.pdfIn PDF document text
    • https://buzyhub.com/files/zulonedekamerikevo.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/5358060125.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0b0e35bc437be645fcf7ad01dc999a7e/pudazudinapixetowineme.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/luwuborelinanuzanidukun.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/mitoxokilogozewemerus.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/601937064.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/severaguderopubup.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/91606659923.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/kovodi.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/57895582701.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/pozifubenagej.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/93021601465.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bd5601e9d---66285031740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+games+2020+play+storePDF 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_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 10808 bytes
SHA-256: 530f7211443b8115b64ab57d3fe86a57e1edeaea320a3131d7187d35a7436553
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 18328 bytes
SHA-256: df2554de91e1a32bb40ed22936952c627426bbaa65aadd7945f5b726c604faa9
font_02_sfnt_off00013735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1