Malicious PDF — malware analysis report

Static analysis result for SHA-256 703bfab2e34d9e98…

MALICIOUS

PDF

89.7 KB Created: 2021-09-13 03:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ce0cb6503f9713299f30ef9c7c9082c SHA-1: 094e923f65ee5f855a0b3c21f773b40798daf524 SHA-256: 703bfab2e34d9e98c0d307bace5e2cb8d2af1c6160f08741144204e8686a741d
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external sites, some of which are hosted on compromised CMS platforms. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://memo-log.com/userfiles/file/92801404908.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d4cce711---mepevemijemifawemajok.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/51161375799.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/6828104093.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81bac13f---nunenonijinuzi.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/nuzusupimuwanopufobolo.pdfIn PDF document text
    • http://boldogelet.hu/media/53385204132.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/suferinevolif.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/37724277084.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/42503540204.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/lakedutaripafirakufali.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109101950573668.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/kufuje.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vadatefuxaw.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/39912543530.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319e82e52c4---40056872651.pdfIn PDF document text
    • http://hanifeugur.com/image/files/42591397666.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/12687779998.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/79197469971.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/98378764276.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/20178826187.pdfIn PDF document text
    • http://lovesenergy.nl/file/nirogizovuwewomafupilut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+club+dream+league+soccer+2019PDF 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_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 11296 bytes
SHA-256: 05b7d0aa589025da204b6155b9cf040e09aac67a03f51a389fb08e99816378b2
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 20092 bytes
SHA-256: 9ca8daeb6fc70a49a49c3acb26729036e0045b06dc393878d5936f7c192cec06
font_02_sfnt_off00014094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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