Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d19859a4f5f88c9…

MALICIOUS

PDF

74.9 KB Created: 2021-08-13 13:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27a52fb218c61e93e7ff9d440056ab75 SHA-1: 07119dea7e82856e8d70572efa68e2bc8a205b15 SHA-256: 9d19859a4f5f88c988eeeb5d545fe490871ec0ab75a1a3fa93fa247e2db35f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous external URLs, many of which point to compromised CMS upload directories. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to distribute further malware or lead users to phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f4adb7b91d94289a752f7202f9989b33/76791615383.pdf In PDF document text
    • http://dorp.pl/userfiles/files/17022042413.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/20366519436.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/gowuxijepiruwemiduru.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/sp33t54505k5bv5e4umr4nmsi2/maxakagurekumo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/92070274802.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/bakatufikakalopiwud.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0b22a6c5---51888298659.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/nozejezaxizobemupatuz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608457882c59c---30720541935.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3d0dda3a---xemawixuxobazu.pdfIn PDF document text
    • http://ciskmv.com/css/file/24225686738.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7564506d---56364614400.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6154ca278---dapede.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/36429913590.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021080200412717.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee632be5421---10648731858.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d699274706b---raparu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/rumudijuranotusev.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77f68befd---80016148113.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/jebusinevokejama.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3e9b56aee5096eb8ca366c81bf50829f/kanizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+program+chamberlain+liftmaster+professional+1%2F3+hpPDF 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_off0000bf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 16612 bytes
SHA-256: 6ca2a5e3d53ae27c4388095a1267d9b997ce77dde2652cc406908dc8ac47e652
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 11400 bytes
SHA-256: b03a337a69a23a3f469c6daf6020ec816af89cee26b609664c93584642b728d2
font_02_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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