Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7a9082eccc44cb…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 21:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3d6146225627d6ea936d9f04e0e024f SHA-1: 6677c356d528a089c3d4c494ab4b837c8d1eafba SHA-256: ea7a9082eccc44cb53e5b883b7d5184bf8cfc69e7a45af7b67a42cf6b7c7c215
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://1night2day.com/UserFiles/file/31005918579.pdf In PDF document text
    • https://commonlawhouse.in/userfiles/file/54588135951.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zafobonemamososumux.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/maxatal.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/misubagikizaguleni.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/16747647993.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf280786e---katiwizi.pdfIn PDF document text
    • https://schmitz.cz/res/file/3494317270.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kuwaseziwuvu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/793e538ddead79211ed4a2d2b7be4cee/61485209075.pdfIn PDF document text
    • http://yjccnc.com/upload/files/zozifikudefudawefap.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/19031088160.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/79o5gcvhemmunpq8t4fnt2ll10/naxiwotedupirumivopek.pdfIn PDF document text
    • http://synergyproperty.com/images/files/86790096822.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161489e065b4a4---84432901976.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/kuwuwemiwanixorase.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/55825817156.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/bekutovej.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/bezuvejane.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132d13817946---2589451319.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/5030697558.pdfIn PDF document text
    • http://unsersohn.com/images/file/dofokivakuduvasifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sidemen+book+read+onlinePDF 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_off0000ac8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8B 10452 bytes
SHA-256: d673363228e25311b8867a3552fd3f7597d1993efcc822935a93dc5aca25059d
font_01_sfnt_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 15372 bytes
SHA-256: cc6f10e8e158a67c826bbab35d27ae859d4f8968e7d6928a2dbf25facc92b620