Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a5e6301ccbacae…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 05:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e0cc13ed246fe04b3e6d828a6ed1aea SHA-1: c88605d887baf609f4b4edb76a084eb9eb3ac17b SHA-256: f5a5e6301ccbacae065503976b06a9a10f0f7368bc0710d5c664325b011e9c12
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://foodexgida.com/uploads/files/83092754924.pdf
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/54952105309.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/21729627034.pdf
    • http://ingmontagna.com/userfiles/files/zidufewemu.pdf
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/wejenivajejase.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/jujek.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8079087e---zawenoxaxefuj.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614acd4d90922---wusesudi.pdf
    • http://mgrima.com/files/file/73511489423.pdf
    • http://villa-margherita.biz/userfiles/files/36197260565.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/geruzibibozowo.pdf
    • https://kaplaitalia.it/userfiles/files/67693243316.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3fd31ea6---79820410478.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/96760874686.pdf
    • https://testgit.begurholidays.com/uploads/userfiles/files/48101051120.pdf
    • https://tyeetomsfishing.com/userfiles/file/95339291199.pdf
    • http://inspeq.eu/public/files/paxilupazola.pdf
    • https://steammining.com/userfiles/file/49966503779.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/fetefiso.pdf
    • https://imaggu.com/ci/userfiles/files/4999935541.pdf
    • http://studioturina.com/userfiles/files/12675402997.pdf
    • https://byocamacho.com/ckfinder/userfiles/files/ninatunaragefomuxemunu.pdf
    • http://naim.naparts.com/images/fck/file/2233119065.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+tablet+boot+menu
    • 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_off0000b15b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 16792 bytes
font_01_sfnt_off0000c972.bin
2a5343d7584651bee0221db971ddcdae6d3052ab6042c5ba3e2c469dabb23056
pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 10460 bytes
font_02_sfnt_off0000e121.bin
c519d65f8dec34fe2f17f3e72d39f7fc7d290de749c379e26fb6f97a00822372
pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 16864 bytes