Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b88b441886c75f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 19:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 732782692f84d3d58f86a09320692ff1 SHA-1: 8d5f2d3c7924fcb3262001f9246de0555aef06b6 SHA-256: e7b88b441886c75f36fe21a4273f53b4cb0cb95b1c6fbeccbe384e3c1ce1216e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links indicates a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://1night2daytour.com/ckupload/files/xozopadisaxevi.pdf In PDF document text
    • https://ambient-interier.cz/files/files/97846870223.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/797d6beeba9faaa4cdc56bde6523d602/58573348057.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/37724277084.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/49627403288.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/tolugozeroxo.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210916104832.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/dazibowe.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/52941795918.pdfIn PDF document text
    • http://attlas.center/userfiles/file/mipozibo.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/reroxetararo.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/38784567098.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/69020330583.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/sexoduwuwaxibesure.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109050806111047.pdfIn PDF document text
    • https://unaizahic.com/Files/files/47979400914.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb84cf01f---65096150340.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///36940613129.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/mevimosapulo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161380f4fcf94c---47542933631.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301089bee75---57509910817.pdfIn PDF document text
    • https://ibericadearmerias.com/file/56168109084.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/sugixusoxekanibozowizew.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/majorulupavamatuxix.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/tepimup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=open+phone+lockPDF 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_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 17856 bytes
SHA-256: 5833f087d27c156b9c1a8bf85b4a52e19fcafc15640af060b82712c9201a288c
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 9968 bytes
SHA-256: 4c2f2130dd9a175e77824e40b34ba821ef2d826f1205c540671bc630db30fb19