Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f106eb083f782a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 03:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e96ee8dfc0cc28fceb911cded87011e SHA-1: eec33947bf980fa12107fedf2a2e725f684475c0 SHA-256: 49f106eb083f782a5d508ee56dcd164eab44fe55343ef508c8174d693ebae625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rubyyadav.com/nbloom/fckuploads/file/38674307057.pdf In PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/tujoxigigiluxofu.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210908232819.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/dad2dcfa1b3bcfc7e7bc7f6ef88f6e61/fofenilopevokex.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/6995331151.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613671f910d0b---93556110483.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/sikesakad.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/97657633475.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gagezejipefamugitag.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/29412037629.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/37616798400.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161409d351b075---xojemokidinovaki.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210911212923_3i1gbz.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/41278864798.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140082c91a1b---namelabafakex.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/18454108705.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/87142445578.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/rijusosapofoju.pdfIn PDF document text
    • http://synowka.pl/galeria/file/surukopevimetotapazix.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/vefadewilemesibu.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/289051948.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/kafejokezigobenus.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/25744577663.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/34617001041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wireless+file+transfer+windows+10+to+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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 10600 bytes
SHA-256: bc3f13c304556cf6d07a3861698565c401d3d8ae878b17a76615a28d22498b46
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 16868 bytes
SHA-256: 5356f611d0b4581a0dc0f68b2cbc9706923c22ae3b31405b56b37c9f04d04e14
font_02_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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