Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f72f8b8fad9f252…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 07:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa145f5c5083f12d9f4412cf858ca0c1 SHA-1: 003d7f6fc68ca0592995301731d1e91eaa9c44a5 SHA-256: 4f72f8b8fad9f2528dfbfe3c8cdba878a7795f3ec9e33ad564d7e828e6759914
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=shadow+fight+2+mod+apk+2020 PDF link annotation
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/torugitokojagewefefon.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/sekaku.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d4f0e12fffc76f82e726f9fe5bc277f7/9367064802.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/tavatugavorureradotimuna.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/patewari.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d159d062661a8f660854f25984937fae/55522099785.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e388a2f8---59117674639.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/gomomimemiminuxuba.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/faqce0aefgp1kjt8l2o5gqplio/97542325034.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/47926525405.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/16035429951.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f92fe4ecb5---tusujoxid.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109170626149013.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4d32699f7b3cff7c43d6c67986960489/30034762197.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/pudabepajofu.pdfIn PDF document text
    • http://vit-physio.de/file/wozirupovinewaderifuzi.pdfIn PDF document text
    • https://sanidom.pl/img/file/11446583455.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/bupujeli.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161393c4bab58f---77646390109.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/97043241523.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/fumenamiviwipasewomul.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/radefujimen.pdfIn PDF document text
    • http://forti.in/userfiles/file/ranakofonuso.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/46097941396.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3935783130.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/94252897977.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_off0000c27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27A 10888 bytes
SHA-256: 7d54b1b24941fb1b279059555e8e3e3bbedaaf2162fc7ae245865cd1be4133ea
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 17436 bytes
SHA-256: 69d9e9757f18b6c9f02040866fa09d3dfe3f087cefe6e5d228bc343c225dc980
font_02_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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