Malicious PDF — malware analysis report

Static analysis result for SHA-256 1112fe3e2ebb55d2…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 14:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f34249f7d6899516940bb9cc9801eae8 SHA-1: c1b201a26e8a7f442c307789dc6e8c0c17b2e297 SHA-256: 1112fe3e2ebb55d295c9fbbc42706b6b4d02169a8ca449f6e00c9ca5595bd23e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics (link farm, compromised CMS upload) point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/fca5bc4bd7b42076f9f98f98e01dfe8e/33472776364.pdf In PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/92546631818.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/5345046580.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/39856318142.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/63182001403.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/lodigebomazukibiru.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/88846421537.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/36917963549.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e2e9d0f5e---zatidaxijitiwivu.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/89350195008.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210702013131_bWF2ZXZhZ290ZXhpamlrZXBpZ29mbw==.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5da3f0ae7ce36412920d1a18097a78a9/jivimepujugibalifatovefe.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/92750740283.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210603_9CA160ECCD212460.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b15cc469d80---79330521036.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5ards1ltce8g424pn901cgotf7/69392506604.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3eed2cd2c05c653903eea4b4b6cd2c8a/zovejubosop.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607794f862f41---vatuxinedeluvogejimilagis.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/38462318324.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/ganewewafozemilurof.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/98380530092.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c08a4b09277---9874715233.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f655dfe7---5511217300.pdfIn PDF document text
    • http://indecomavo.pl/inc/zokuvololomadosupuso.pdfIn PDF document text
    • http://email-database.info/userfiles/file/modowiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=payroll+in+excel+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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 18968 bytes
SHA-256: a448d5de4ef43b56e5593a4498a3a3ad5ea61d8a46d82c1318507cde6e34799f
font_01_sfnt_off000126f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 10564 bytes
SHA-256: b3f41ca3b732dc5f21dd7890d893bafd925c56a0bc64dbbfbe97154d4c9f7568
font_02_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1