Malicious PDF — malware analysis report

Static analysis result for SHA-256 150b2c396adc6e2c…

MALICIOUS

PDF

93.5 KB Created: 2021-08-12 15:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd3e45d079b66903b1b3d754fce5a052 SHA-1: 4f0d352e27618d716b5e3b9f0dc08e1eae0167c3 SHA-256: 150b2c396adc6e2cf070335b10a95894b69dc677450589ae6aa4da758222689c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure itself does not contain readable content, but the presence of external links and the high confidence malicious verdict indicate it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://jaatkinson.com/userimages/bemurefabulafemi.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/pofabozeridupekugikagid.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/53679575733.pdf
    • http://www.horakgolf.cz/ckfinder/userfiles/files/96463640859.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40294304132.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607895b5119ca---lotizagidetafukodaritun.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fl9hhmbrmjg6kpdhcal9ak5jn4/luvabevutunopabujuleseb.pdf
    • http://southport1969.com/clients/861680/File/83757837336.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f3074f8b6a29933246605aaadba1b4b7/kimexivebesadumadov.pdf
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/zesafozamefaxibaribufexum.pdf
    • http://e-cluny.cz/UserFiles/file/48955267224.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b37e400e986---zidupajabexivano.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/946ef56430c1f9bfdc7347e828f0f8ab/93267483725.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/05751adb509fa78d7a097da3661e1ab5/46956964984.pdf
    • http://daiwavn.com/uploads/image/files/11722023186.pdf
    • http://chiesamadremarsala.eu/userfiles/files/7573038050.pdf
    • http://greece-ex.com/images/blog//file/pasifewopixajinaxome.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18b626bbf---57993041736.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16100da9c9705e---25809672257.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c221dc181---79748681525.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807569711c2---nixonasoseboja.pdf
    • http://calhi1974.com/clients/46234/File/24038299387.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3282746105---xomidoxemafomate.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/278995962857b51b0618c3bbcd8bb5a4/gimifufixudevalaw.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4807387942---modufefejonezexapopigupi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=emil+und+die+detektive+zusammenfassung+pdf
    • 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_off00010461.bin
30494ae56782d1c0b2d508923c0c2c3e756eb09244d04d41981a183e757cc30b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 19100 bytes
font_01_sfnt_off0001342c.bin
cd402e3e6bebbb5d1697f4225f4fd7cae741c74e62f7a11e2593a38db5902d84
pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 10920 bytes
font_02_sfnt_off00014d46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D46 16792 bytes