Malicious PDF — malware analysis report

Static analysis result for SHA-256 59266d45cdd47e10…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 00:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 87c1d97367bae69cf9fa5f3d8b0da789 SHA-1: 5ccb502ec2f7eefa919feb8deb62170032c31d16 SHA-256: 59266d45cdd47e10bdfa5352a7705a51df1b738917cef246763efd8ec050a0c8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress uploads and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. The embedded JavaScript likely facilitates the execution of malicious code or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5181

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c79cc0b77b2---70272910780.pdf PDF link annotation
    • http://brlairport.com/images/file/93088769020.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f63b3c8ee---38836255410.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a759b1a4083---firetowabadise.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e760a28ce0---biguniramepaxozaxagu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748985befab---5417423322.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b135b7cb5f5d56ee321119a26caff396/rivosupa.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8539b421a---ririjiwanajopetebolepopuf.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c917e34b8269d78166b199703f85b60/36458201664.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/42612559968.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a418fadc2a6---96019993052.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/h0tieueogjq3l18gfeg1jrg2e2/liwoza.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c2199cdf---82794097320.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/napatevutelewulamisa.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e365ed1026---lekedetalatafiro.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/73413420059.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/db1e1f102ab31d6ea30911bd6ddbeca2/97067030565.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/e78605ttesq9jig3gf55g0udnd/6245431130.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/49104223494.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/321550346.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/98936757200.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/r052iep9k0gtqa683j1jrtv8t7/82159579514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=reading+comprehension+for+grade+4+with+multiple+choice+questionsPDF link annotation
    • 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_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 17324 bytes
SHA-256: c7128ba7e627f95897f077808feeffe813c427f000c84f18b588e44980da1066
font_01_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2D 11520 bytes
SHA-256: 1a79d90e2e91b0b7750ce1c0cee2d2c37f7364cf372374276855388a04c521f4

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