Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01440f3fdafd948…

MALICIOUS

PDF

73.4 KB Created: 2021-08-27 23:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea721592f57187db282a1550820f1076 SHA-1: 4a4364fbd0d8a9644de86b967825f0bf2bfd6bca SHA-256: c01440f3fdafd9485fe8a10e6537089ab2570a7aeafaabfbd9d9002d666bb699
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://poiskvod.ru/images/file/91094663765.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/garunopigiwafufozupevon.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/95798543754.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08a065db8---48980852971.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/fixonakeponidoxe.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/27909912469.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c9f0b016adac0ff8508113464fdc3c33/71483608053.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/savinifetexeleketima.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/718bfc7d6e3d897d8c1590d126891c8b/13013667981.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210702_079B88193D2D734D.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/65930543603.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/rabumik.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/vemasug.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa96f0c5abbc9e9da861f02d650cc3c7/wezafevajex.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/55163656274.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/tuvejinovinimigojusez.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rgdb3ms58qm6ouh7gl7lrvjsm5/sagatikisabudijufoluf.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/86664333661.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b000befd694d1d7bde6af7d5d3569cd0/86248182784.pdfIn PDF document text
    • https://airshow-bg.com/file/81177040607.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/40902395711.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/94511862684.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/92376163559.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c185a8c48c1---rikeb.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/wivipafekudipeguvarebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ac+odyssey+sphinx+questlinePDF 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_off0000be00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE00 16068 bytes
SHA-256: bb9df03461aa1b125e753465c7f20ac1b314a617cbebb0ecd30e4b370987445c
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 10792 bytes
SHA-256: 8a272bfa2f1f2e27286401b07c05d587f2dee483413bbc47c297412ad7b67b30