Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba7d55481ec0c82…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 09:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16fb23f7e601ef8749f943aee94e9ea0 SHA-1: e8b797ddc2d3c2a5847e6033d336ab6bbe1dc2c2 SHA-256: eba7d55481ec0c822376bda483696df512fc0580d4301b70ee7c9338fdfcb6ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cosmoscm.com/contents/files/88024696278.pdf In PDF document text
    • https://harkakotony.hu/UserFiles/file/vikunugagujibepazufeza.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/wikesimezaz.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokalifulewa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381dabf2246---36048603552.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/64326674607.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210905190539.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/dupeviwut.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/17282395571.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/pubokagujewefakofojojo.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/27749682386.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/lawozu.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/vifenagukanowijulisoso.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/88520917636.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613611c45ab61---dizizofovovedokelajeleg.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/datunulo.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/73054732581.pdfIn PDF document text
    • http://machulski.com/public/file/mizogukavidure.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210903132435905717yf1y69.pdfIn PDF document text
    • http://jarosi.hu/files/file/ribup.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0ju8mktr9jh4iqico5f6acp6m/bamaxufoberazinotu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/rovopepokixixunatunisinaf.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd9051119---tulorasigil.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/49171634970.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/latizigejezuve.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/em9p99irjnsepc5i9g85c078o7/22611938020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=good+multiplayer+games+pc+2021PDF 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_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 17816 bytes
SHA-256: 757e761fd95c7412159bb8aaeae244469aa7ac4b79aaf0cfe4f1c35c05090b73
font_01_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 11300 bytes
SHA-256: 867f83651561962ff8c26fc880abfc133a719c797ecbcd46c0576eb99ac35d50
font_02_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1