Malicious PDF — malware analysis report

Static analysis result for SHA-256 d026bead67afd2e1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 14:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb3937c4d9b533a5f7636b7e6a1f78d6 SHA-1: 9db20b3c7de271c2c9f53db2ffb60a07d690e875 SHA-256: d026bead67afd2e1c73719db2194c50f858c0acf211cdf497dc11bbb07147d8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zrdb-drogbud.pl/Upload/file/fusizore.pdf In PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/34462092300.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/44098916355.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/kodorozamigerubemefilof.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/xodudonotumebaroxakofo.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/vusifagefijonufifur.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/24203912290.pdfIn PDF document text
    • https://designclarf.it/file/doluserefiki.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/bedisabilidiribijobutinut.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ae50c8f6---31401713726.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/cgloaa07h5t8k51ofcfki40mn2/wozurifolesujidu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/p1fdqcit3f6bqqtkm5ij5s4vfh/gutedekeravozerara.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210910075051.pdfIn PDF document text
    • http://szm.hu/userfiles/file/noxowirujowowibog.pdfIn PDF document text
    • http://szpk.hu/_user/file/jafujalezodularaza.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/83183368393.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/rufuf.pdfIn PDF document text
    • https://pratham.one/file/25705073343.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/werosoxutobuma.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421303e53e1---90784506169.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336dd101eea---95224474381.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/vuwujorugasos.pdfIn PDF document text
    • http://chapelguild.com/images/usr/rixitinefox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=eyetv+micro+androidPDF 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_off0000b0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 10480 bytes
SHA-256: d1c479c1ddddfcade507fbb3c3e928cc0f427ff9f076ed0fa5fef3896179777e
font_02_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 15292 bytes
SHA-256: 9ad8be16d8d2c7a8871ac6d2468be8ba9a6d64a3be4a0adf1289d26923f0a874

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