Malicious PDF — malware analysis report

Static analysis result for SHA-256 911ff60d9a7179f8…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 19:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8881fe161e7caf6a76879490be73e7b2 SHA-1: 512d7842302aa2cedb9d9146e16db21832e685fa SHA-256: 911ff60d9a7179f893a0b2480e9cb0915517e373b587abb9b6eac31e0b597c45
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441a10c492f---5629003917.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/metakawo.pdf
    • https://otoform.com/upload/ckfinder/files/31960803739.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/19970585560.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/kutudadanilematugif.pdf
    • http://bielle-srl.com/userfiles/files/tubikatemasozexejemejob.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/36414749402.pdf
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/97257965851.pdf
    • https://goldengatetaichiqigong.com/userfiles/file/sorajat.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/bipezivorujinawofasosod.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5afcba76989f66a5236072dde4267df3/5966425890.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/fojuzadoketitegitawe.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/28253039999.pdf
    • http://showplus.ae/userfiles/files/1851782055.pdf
    • https://beldapin.com/calisma2/files/uploads/49250693664.pdf
    • https://akilanews.com/ckfinder/userfiles/files/4810464412.pdf
    • http://fw-simple.com/uploads/files/92241119167.pdf
    • http://211.129.1.225/system/ckfinder/userfiles/files/jajor.pdf
    • https://mygrind.ie/userfiles/file/lajujuxatofebivawawalu.pdf
    • http://unixsensor.com/uploads/files/202109062315413225.pdf
    • http://snp-ent.com/files/fckeditor/file/1432373401613e46732e9c7.pdf
    • http://riskhedgetech.com/uploaded/file/770605775613bad00d2916.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138da941b684---85845335766.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=important+phrasal+verbs+for+competitive+exams
    • 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_off0000b33e.bin
2a7fa80ec1ee583a4c52b4f698a6f658a98f679018a46cf27aeab75b1f781e27
pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 16924 bytes
font_01_sfnt_off0000deca.bin
0fbae5da78d58388e7ec1583be5aada0ee8d425f1acd20ffc5f4f99b2d496101
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 11004 bytes
font_02_sfnt_off0000f7f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16792 bytes