Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90973338701fead…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 05:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5435c0bee770ce3d3bf19eca1827111a SHA-1: c39cd369a3b729148cf3647716c8494ed604214f SHA-256: f90973338701feade0325ecb646950eba2922247bce4c4eac7c087ed6e938bb4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of 'utm_term' parameters in URLs suggests a phishing or spam campaign aimed at driving traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=clip+dj+converter PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2l06c5iut5159mqjb863gf0s2v/5046345472.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/15259462012.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/98942112670.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/4uuc065phbeorf6brphekp7338/80288392522.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/49987853543.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/likaduvixo.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/21282603482.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/bimuvuri.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/muleketesabezivavuwaz.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/91353594129.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/jazoxujitilebogorifol.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/lamuvelozirunadavoku.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613907b5a000d---sikebikenirafuwu.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/59450131249.pdfIn PDF document text
    • http://ashioke.com/images/library/File/52357584607.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/57135953424.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/32747728244.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109051416507089.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/naderojizovo.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/10562583973.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sarubuxelavisof.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/gukudevadiwagaxuleliw.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/nawevuwejipagefofo.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/bodibal.pdfIn PDF document text
    • 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_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 10404 bytes
SHA-256: ffe89aaa287065ee108bb6f5ea1f7fb78ce7bfd7a2a1089af8d899aa05f37679
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 17276 bytes
SHA-256: 6a93bbef702b188d7d6de060bb4b87725ced476913101b223bb85b136af9716c
font_02_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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