Malicious PDF — malware analysis report

Static analysis result for SHA-256 9109f29b6a437167…

MALICIOUS

PDF

86.6 KB Created: 2021-06-27 10:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0771bfcc529789eae934eb6721adedfa SHA-1: 7e2287b80f730af9e9d7866aaf8a20f07fe7c115 SHA-256: 9109f29b6a4371674e6374398a879d07d2e70945be3838cf3b9e35cba5ac0c76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • 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://happypalettebnb.com/CKEdit/upload/files/dubudet.pdf
    • https://clumba-indoor.ru/files/files/bujilulafiw.pdf
    • http://mosvag.ru/img/lib/file/95570253095.pdf
    • https://audit-advisers.com/userfiles/file/9162028172.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa114628af---41509582964.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/vumutijelisoxozobanerodo.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a303532ae---53977068510.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaacd2b66e---7828371034.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c452e0db5306e6aba6611e38ca47fa70/38438087504.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085b064c0124---perazebuwijef.pdf
    • https://wolfgang-photography.com/userfiles/files/lajadutudegig.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a06aa09fb---50760336087.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a0836dbcac1ae34502965a959ab0a823/62993236740.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160771793b8160---wivexafiloweduruwi.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d128169d207bd3f72c1227e3eb37eea8/ligiromutojezogove.pdf
    • https://airbays.com/userfiles/file/62165928368.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae23dde50---wejurakexixilaweji.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9358899836c6f66b74bb1df6c83951f0/tabej.pdf
    • http://yjsyrj.com/userfiles/file/13450062157.pdf
    • http://signaturecruise.com/js/ckfinder/userfiles/files/demapaxafar.pdf
    • http://jaika.in/images/documents/files/viwogojoxogopomib.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4lmbig2hm96kf1m8sd7hhfm5l4/18220143301.pdf
    • http://originalcheck.it/public/img_admin/file///zukakutolojasamuwobuwax.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7c55fb1e95f1337c4fa0c6ef81a21724/xedoza.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/89adrrnr8ktniaksdvnmut2kbp/supokexujaranapagemigi.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3cdb72c8---zevixavexawixale.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=solution+manual+financial+statement+analysis+11th+edition+subramanyam+chapter+7
    • 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_off0000ed2e.bin
d8142fa05f5351ab6351bed1b509b8a5816acdcd06ee1d89a8d7457c6a102689
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 11416 bytes
font_01_sfnt_off000107c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16792 bytes
font_02_sfnt_off00011fd9.bin
997e4253ec45a1e94471ab3b4ef7f10af2aed2bd5e1e4e6ff1df067c9a1a77e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 16952 bytes