Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c17ed79affc8356…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 00:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf27fd0acc6dd07eec199ad0b87e7c87 SHA-1: fcda6d4b351bf0a99133712cdb8a799e27ae71aa SHA-256: 2c17ed79affc8356fc900f81407f11f11bef5796edd44edb03fd2085a0c899f0
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links on compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bdsductri.com/upload/files/92153753538.pdf In PDF document text
    • http://hayatteknoloji.com/webimage/file/xezuj.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/53armarhvlkpce7g82qsk98mo8/35833982703.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcac2eecc---90822508725.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/10904055791.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7m1vu2nu4b9vem1qk0hs54m4tl/19918866536.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a584caea---47034359925.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/birimapijavusej.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/1668122190.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/57261127057.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078038409925---15715292937.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/mefanamozovotisosogom.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/350aae2ab5aaf8df7d5602b255e29e93/24728045549.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/86496835088.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/95025506026.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/povin.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/51035975587.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/zupifus.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/zutekefurafebiwe.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/difimiponawaninotebogu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/dozanipunilur.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/90686635025.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0kpe2vv0ahotgcrsiattshrif5/safipinupamegususaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+cite+without+datePDF 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_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 17428 bytes
SHA-256: 920f7d93060e3cecdee68384071b19a898911887cfe90e871b6ec16a36239cb0
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 10224 bytes
SHA-256: 14ae32a5326cdbcb37915c689fb643f774ecb65dd79c8d4530d53f9b51e332a3