Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e00e5992599d23…

MALICIOUS

PDF

92.1 KB Created: 2021-09-07 05:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb1267373ffb91e85897d16f7f740fe4 SHA-1: 5e812d808bb2cfa18e897361b69cb118950f9392 SHA-256: f8e00e5992599d23ae39c3e1a4d8185c00811b1c16a78dec63ed2bcaa27c7024
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lead users to external sites, likely to download further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

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 http://upoart.com/ckfinder/userfiles/files/jopekexo.pdf In PDF document text
    • http://gurukripapublicschool.com/userfiles/file/91917958072.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/1d0d967f52203542917003e7f957062a/18749765477.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/gabol.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/22740804892.pdfIn PDF document text
    • https://roc.mn/uploads/files/pinepefekopibogepop.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c7018b37---26748400054.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/77220205978.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/netofajud.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/kafanizedibowuwapar.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/gilekegazu.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/12320766647.pdfIn PDF document text
    • http://timebymtm.com/upload/files/14077206775.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/sivuluwuretozokiwesasoj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32288b8d1---89922983584.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/85552999032.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/foxera.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6ca56ab5---sifolow.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/5qrs4ia8j73c84r5jmsr5ikut5/wapoxetafe.pdfIn PDF document text
    • https://haidangpc.com/contents/files/89426113270.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dawimeg.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9235a51d10940ca534ae77bcf72576c3/ladozupipigibekipumok.pdfIn PDF document text
    • http://inercial.es/uploads/files/pikaduduzugodiwogurev.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea31b406c4---purixodiruselit.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/gejemewufokataniwirepi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/fizexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=american+english+file+1+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 10884 bytes
SHA-256: a51e981f301b57b8357c22e7116a7fd09e8b2a236f94dd3e417a115655cfc73a
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
font_02_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 23708 bytes
SHA-256: 0ec747cc0bf4ee977c1b94d7f9295d5f644c80b61678d628d10dceac2e35e5c3
font_03_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16432 bytes
SHA-256: bff422d22586304a163e2efda4f8e1a003b1a4e9f3efdcdbfe1801662fc0f5dd
font_04_sfnt_off0001490c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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