Malicious PDF — malware analysis report

Static analysis result for SHA-256 7208f5311bc76db5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 04:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: efc9ca439b24306a9444ef42e55c1805 SHA-1: 9ad5510d3d20e016ef6fc19e4ca5bcee807101b8 SHA-256: 7208f5311bc76db52261c9521dfe63d5172e99d38745dc6817c36e15081f0a30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5f9704616f17834daa6df12edf084ab6/xuxenusedagexi.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcb8d2fd58a04473fc4f975d5c6cd985/71510619135.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110b58bc9b85---4211858499.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/xovepimonesipokizexefozot.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d316b474e4---32584704194.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/533454bbf2271dae9030c3db6fbcd538/nazijerilikesavawomufa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c391883f4---92697134342.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/97acghpml8g33r7ognuuqf9cj3/91299842970.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/depefibajiborusegiwigarup.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/13952369621.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097e40c0fcbd---kirurabafirodeg.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/4312011910.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/70547543359.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ec45ddd2---wobelifijumaxu.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/2s00sopfbpsp97lut568jhau35/tusowevujixunutobikipetuj.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/sexagiwi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b3d47df95---94607298573.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/wugexawulegosisukirumus.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/sofajevujujan.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b360378f---7023635833.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/82372206088.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kc0u7pb1878gmr4ioovvlc3c30/87620045192.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/37105890680.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/biriwonusarabef.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c382eb36b1bc97a3694167ce6e0b9759/73193994221.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qmhpdrv9clmnhkcp0a2lhbb32t/56303835880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=my+cafe+recipes+%26+stories+cheatsPDF 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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 10212 bytes
SHA-256: 5e143d65706d0a5b524badb2270d60e7e5917012fb8c99c429fe71c925f40940
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 20676 bytes
SHA-256: a3660c1f5377e0237674bc769956c544c24305c16521141decd5052772f08886
font_02_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1