Malicious PDF — malware analysis report

Static analysis result for SHA-256 84584719a29b1a8b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 20:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 239c1394d3b4c40e0cfe0949c72e632c SHA-1: 0a7a2c1e495226dda42bb886a064a7bb637a035f SHA-256: 84584719a29b1a8bdc4e3e88ab888dfdd47ecd5053fd958578d82c5817d07dd6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://clairerolo.com/userfiles/file/87034641386.pdf
    • http://palmdale.thepokeluau.com/uploads/files/rubegetedaw.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161507fa6ea546---rexijoketi.pdf
    • https://ahreco.com/uploads/news_file/18863297669.pdf
    • http://fcraregistration.com/UploadedData/file/44312231040.pdf
    • http://immobilieninvestors.com/userfiles/file/vipivinowebixi.pdf
    • http://studiochiodo.eu/userfiles/files/sumolobuwoniluferu.pdf
    • http://royalgroup.at/tmp/wakemuposikibazazuwaro.pdf
    • http://lerucherdesanges.fr/userfiles/file/wuwawakugu.pdf
    • https://penzion-palice.cz/content/tosegusugagif.pdf
    • http://asesoriazabalburu.org/azaba/files/file/18282012432.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/29143384228.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614c38961484b---kofuza.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/xarobalugupok.pdf
    • http://epicridesnepal.com/files/kiroxepibo.pdf
    • http://kssi.ir/public/userfiles/file/26344119592.pdf
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/47749589018.pdf
    • https://kimcert.org/E/file/jamabumabawufexutiwe.pdf
    • http://windmill-bv.com/userfiles/files/14221194006.pdf
    • http://palaciodelosnavas.com/userfiles/file/sajovatoviwaxufesuluv.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb99e2f2f6---57431259898.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/21099130279.pdf
    • http://miydz.com/mingyi/images/userfiles/file/kobobotun.pdf
    • http://rent-lease-no1.com/userfiles/file/20210919220404.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3e177697edc725fd887cdf69fc39ad11/zikosavasi.pdf
    • http://sushifactoryazusa.com/uploads/files/segewawipuvev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=genymotion+free+download+for+windows+10+64+bit
    • 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_off0000b4e3.bin
3e3704ea97deb941dd1f0aad0eb014b66ea8633e51a883f3b563697c2dd23f90
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 14948 bytes
font_01_sfnt_off0000dae2.bin
1cefb50df472d3de4bdbcfe9f7b5a627fb8619e204ddff07a51754e128da5642
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 11316 bytes
font_02_sfnt_off0000f5a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 16792 bytes