Malicious PDF — malware analysis report

Static analysis result for SHA-256 f448c66e1f8b5f2d…

MALICIOUS

PDF

81.5 KB Created: 2021-08-22 05:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43167c6ccaeb21aa2b91af440ed4be29 SHA-1: 0bceabf2baa9c774c3077bbc5e53aefcbe8d81b3 SHA-256: f448c66e1f8b5f2d06adf3ece8245f6ad90a8c34d5c357bc62485415af26c7f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware-hosting sites. The primary attack pattern observed is the use of a link farm to distribute traffic across multiple potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://abeess.com/userfiles/file/gujebeforurugosinevi.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc52924513c---vazasosijugilokemorazaki.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/1s4b0sdcisnvdn9gqdqd0rqge9/pofugupolisajixarag.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59dffa53f4---zomupasefa.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/58255610607.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/pu0fdnfd6sp0f5rsttirhbv0ef/fejekimudesidizefowaduj.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/xibutaretakanimudozuze.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/61792415913.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/78661321387.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/87985753809.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/rijatazujeguwoxebusole.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/24540085035.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xoxif.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/69165037743.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d58ddf190bfd63d348051dbb656818da/3882915679.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6a2c8c270---11038173945.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dac246acf---40609901433.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/muwonikewagowokiv.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af9416c12fd---tidigusurakavuguxexuxe.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/zuvekalalimije.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/5724581390.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/33535009455.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/71054329281.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/018dba6724fb1e28d1eb9f8f5d6ca3c1/86919865551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=balancing+equations+worksheet+answers+al%28no3%293PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6d7d7c2cc6e45a2909682096e2cd48ee/92167306276.pdfIn PDF document text
    • 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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16036 bytes
SHA-256: b58916bbf10d315b8f83f7643fc2767d5e324f24a796b4986eba85c7fa18dd88
font_02_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 11316 bytes
SHA-256: a0cb4448297c93f58d0b760545324dff82c3fd1b661e883d901878e1d0d68271

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