Malicious PDF — malware analysis report

Static analysis result for SHA-256 902c55bf6f62f779…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 09:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 034b7548c5c4034552a8e98ac30b0ae6 SHA-1: eae66f84250398a2e836085455f6c38ec3f6fe75 SHA-256: 902c55bf6f62f779fba4f232404ac2ff0569d428985ce17baa273b53b89fdc0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://toocapen.com/files/93136578596.pdf In PDF document text
    • https://tramtron.vn/uploads/files/files/30367417641.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/kaxorufa.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/rakaneginebu.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/39328835505.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d318f773c8---53118637484.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc133f446---wobitodose.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/05d0f53f92ec57db9fabc7319dd67503/27979824660.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3df55f37108a87d1691a9c7365b50900/lidasomulavibowaxon.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d0294b6f6---79849964252.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4157ea5e7b160f46a199348285652835/82009626192.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/71450623336.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/95617038957.pdfIn PDF document text
    • http://terminsk.by/pics/files/38469181644.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/44206819243.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/kelusitatugej.pdfIn PDF document text
    • http://machin.kr/userData/board/file/82598648619.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///78286568244.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940e71debc1---gipunulelorumer.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a4361796f46---31131903846.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108211948021864.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/88719332025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=software+installation+manual+templatePDF 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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 10780 bytes
SHA-256: d9a41ed116fa49b6d6e5df1c04880c9bdb41d1eda0de7b81a1ba14eec620bae1
font_02_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 17844 bytes
SHA-256: 425f552c300fa32636a178bc28dc49872912f205454152db7e72a028d560f94e

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