Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d64b2689748798d…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 21:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7b8af5a5d2399f8d166726c25d11b05e SHA-1: 6f72e0331bb371dcbb4505d5632c49e5dab9cc11 SHA-256: 8d64b2689748798dc7d952016a8fdbf439ceba30a61771d6f36fb3dbdc5c4f19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a078a80f5b---soxomerukemivises.pdf In PDF document text
    • https://dolaodong.com/userfiles/file/fanopafun.pdfIn PDF document text
    • http://woykoff.hu/upload/file/75615472529.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/75851671648.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/64063748444.pdfIn PDF document text
    • http://atrsara.ir/resource/files/99961025239.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2c030dd9---81554130288.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210926_224752_150.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/86cb64be079e23d8cd7b053e6d73fd8c/18611827958.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bd1e7fa4c3becd48d12600b13bc9da3b/vosipibirixekutud.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/2952286501.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/52722293431.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/75412232865.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d705c31e9c0ddfe25bc2eb1b55e4a9c7/tufubowijem.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/maduratifu.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/11380732446.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/sipepobitanutejukamu.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/jawofunutaduwanotowefuz.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/12332216043.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e498fd87---71155859497.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/41066603063.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/zawibitakinotufopebig.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441d4ea039c---67310978053.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb5994c35e---gipufeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quiet+place+1+full+movie+for+freePDF 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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 10644 bytes
SHA-256: dfaa99fc1a332afcdff954438728e5ed485c03a61493f423ef7a7982963cae28
font_02_sfnt_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 14632 bytes
SHA-256: d891d2d727d7ae2abfe3607a029b24d41b1d6c2b2b6fec2447b68eb166da9be2

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