Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c43e1d185c66cfc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 12:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcb93b060229edd6bb421ba348c08312 SHA-1: 4f876fb411a5f87a7ca56f079696ccf37a67794c SHA-256: 9c43e1d185c66cfcc635c151ab12a214100fed2fdae2dbff5d4f8f9d47ca9f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model also indicated maliciousness. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9fd361b10---53026609725.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d06913226ad---62250958029.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce275481d---77154927038.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/88410019980.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/75254213567.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/pikalatera.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/tapowuwusizuraveloronilo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b22a5299d---6975484089.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/gabonidudajupadute.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a2ea9b6e8---sobupozomadesorozig.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/82305009962.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a901364d3---xakipekaw.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/wogex.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/fabibutafixasifa.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/telilegutakadusudulu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9adbcb75dc---49855694119.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e41a84463---wekobupenakuwudige.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/vudatafuginemijipuna.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/69312536451.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebc485f750---65155482943.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b805e000e---57335621582.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/84212015666.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/53cc3af90c41865179d34472f301347c/5708150551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bead+roller+plans+pdfPDF 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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 10352 bytes
SHA-256: deb4d31dacc5a0a1333f74099d7e8c8d1241c2c594b1fdf73f4c45ce6271f838
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 18292 bytes
SHA-256: 9d77cfc8cf8257104c2062c11484b4e38c7bd75e4d079d7c919b3cc60baa65a3
font_02_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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