Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed32872c4075866d…

MALICIOUS

PDF

88.5 KB Created: 2021-09-18 23:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81662165f15be627bceacb9623e153d4 SHA-1: ca5525dede56639b15d784e569cb1123011f2071 SHA-256: ed32872c4075866d16e31762b047d78b87085052ed033f8617256483be7c3e8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be part of a link farm, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kahasat.cz/data/file/zafuwitufozekatilozixapu.pdf
    • http://dycelife.com/userfiles/file/muluvedujijidovesu.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/25849054379.pdf
    • http://smolninskayahotel.com/userfiles/file/merezusamedi.pdf
    • http://www.huescalamagiaenfotos.com/userfiles/files/zerara.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/78f92dcebb4d29bed2bbbe107dfde095/81432871740.pdf
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/lavuxopijak.pdf
    • https://robindayne.com/ckfinder/userfiles/files/84828431867.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94308ac09---botinutuvifufojimetosotig.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/gatejituxidodopopu.pdf
    • http://j-line.ca/fck_upload/file/woxewanivadogigura.pdf
    • http://zkqzl.com/uploadfile/file///2021090106571449.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/getezusuxob.pdf
    • https://graphicart.ro/fckfiles/file/diridanadedulimoxitoxi.pdf
    • https://airshow-bg.com/file/66158268506.pdf
    • https://avela.md/userfiles/file/sevobeteji.pdf
    • https://pasifikendustriyel.com/userfiles/file/88653422806.pdf
    • http://smingames.com/ckfinder/files/nisaveperarugixabepolola.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328f5828edc---lerisejitesexeg.pdf
    • http://julianina.dk/upload/file/41585471199.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e8227364---2253402881.pdf
    • http://koppeika.ru/userfiles/file/pojuzulal.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685e944bb9---44779211524.pdf
    • http://spiregene.com/image/files/20210916_013551.pdf
    • http://all-premium.com/user_file/files/65841376050.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+wonder+woman+movie+in+tamil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16792 bytes
font_01_sfnt_off00010dc0.bin
ef8e1f4d4326ff1d3afd2a32615fb88f00033ee1e8122b92de474b26e2a15757
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 17976 bytes
font_02_sfnt_off00013cc9.bin
fc3937a197070c649e8ddfa6ff173612429a9ce7e9dd33c010d390bf0648367e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 10392 bytes