Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49d3d0e3541d218…

MALICIOUS

PDF

72.1 KB Created: 2021-08-28 04:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79462977e12aef95501ebf158cebd445 SHA-1: 032bb16be1377af1941ee8c13c8dbe8abf78a7f9 SHA-256: f49d3d0e3541d218a631389fbc4c4457c067c2095071d6ff46c83fc71d0f290d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which host PDF files and appear to be on compromised websites or disposable hosting. The primary attack pattern involves directing users to these external links, likely to download further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8859

Heuristics 6

  • 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.
  • 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 https://jahanchart.ir/data/files/file/kimuvatotofi.pdf In PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/velud.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9f19d0eb---54864945705.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21072304130269381273m6lwkk887k.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/bakifo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b80452d88---zoxuriloxodeguvebovasefux.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/28066767728.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1943630c---lowuto.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73fc7e6ca---77893915292.pdfIn PDF document text
    • https://phm.vn/upload/files/rimaxumabotemonalo.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210804071146.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9d3790d6fe---60538946910.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/25sf8f1llfkkgtj4njua4jlc46/nutilomulubifi.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/dutolixurudenipoxa.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/tedarawozakatoxutakodiv.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c980d9eb1a---teperajobo.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/j1f3mau06jooriuu2omgruegu2/nasonojevimosidu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1611857f06f685---tutuwek.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/85gc4fn8ri7tjrqua31dskon3g/22797404247.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/pomakidebupakuda.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3048787f9---64838897142.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8v000o3qapkh3l5b3mr12dq12e/bijizodagonovo.pdfIn PDF document text
    • http://bawaniint.com/ckfinder/userfiles/files/vabidenojonabopir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=all+eyes+on+me+2pac+mp3+downloadPDF 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_off0000c052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 10856 bytes
SHA-256: 2f9be8efd70dd00e25efd2b0ddb96c9129193fe41d8d72641c8b6fb4c1b68944
font_02_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 17260 bytes
SHA-256: 23e6c62c6c8331a77cd52e177c0ce2f9760554ab822a9ba6ebb9d59e19b353f3

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