Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef5d3ce2ff72939…

MALICIOUS

PDF

84.2 KB Created: 2021-07-08 05:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29bd6410bf285013af6b2b827d6acc4e SHA-1: 6e3deeb8ea1bcf5be2f2a050228d47115bbfb95f SHA-256: 6ef5d3ce2ff729393f1b1da9048c4d688c910587a9d51a5a7b86cdadd097530b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content, likely initiated via a phishing email.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vl5e83jtv0ld1h3222prdt8s5c/kodut.pdf In PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/fexakebijo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5bc58e2c---88968446749.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/40633810549.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk6u9scsv2hrvrm7h05qe69nec/31145790498.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/189fe756fbd837b8f56db0de6a7b49ce/35538907409.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bd09e00b894a1dfc61e4f6ece3dddadd/xifetunolufuxumebasuz.pdfIn PDF document text
    • https://jetaime-shop.com/files/darilamapalajasow.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/sojoburedamajujirup.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d5331f928c67ff60090556567a1521b2/56120828052.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/zimufige.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/vefalesasimawafij.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/40155439782.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af04ce5ab---89629671593.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/laved.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/zetimonositoluranetesiw.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4f026182---paduzane.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9d7df2c0b3b36878f7455d693062dacc/90616834598.pdfIn PDF document text
    • https://digireg.com/upload/25620296208.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6og7p0jfhd0a16feopr8ot9lb5/lenegozoguxudimaler.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nopawugog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=contents+of+the+dead+man%27s+pockets+summaryPDF 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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 17356 bytes
SHA-256: f3a533a33d4ebb083cb7262ad4f79024fd3e9766d7d3c5e77ab17d73d88d4a59
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 11120 bytes
SHA-256: ccb98051e35bf00c341e8eb3c16965c54f2710b950e15a91dc40cb99c60d0160
font_02_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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