Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d675ef2e27180f…

MALICIOUS

PDF

90.3 KB Created: 2021-07-03 12:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d220f5a3794bf0579fafe1dd1ed90a0d SHA-1: 45fe487d0db4dbdd96816a9aa00e94a62c0af970 SHA-256: 40d675ef2e27180fce2260644e30124d22e417cac93fb945de3c8799de1d9ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious content or redirect users. While no scripts were explicitly extracted, the nature of the URLs and the detection name imply a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62323b526---71428399937.pdf In PDF document text
    • https://khabul.mn/mmpa/userfiles/files/wovoda.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbbddc30f0---10695965337.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/eba5c85199c418713f3722758207c0ed/87739486231.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/29589378369.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3291a7tban6upu06g6805kh41/bomedelokifukif.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/39282223393.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/acfe5e372fec16b2d06f180d6306135a/47122800658.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/moxizuxiwe.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608372105ad1c---sutuza.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f12a6639f---xovegowivinuwiwuja.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081952c466e4---xamuraluwuvesegolalel.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wukuxumekepoxozipifa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1585e4f14---bifomeze.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60857f03d---puvitatufigibuzusipur.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/oa2hocikkcd9ca26gb7rjcmbp7/9994146299.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/73047004263.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84c9e1bfa---70523782289.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51067435686.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/3961715176.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/5648b1362a01d83ed4ff4152f49eb61d/dijajejurugowexi.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/812410ca1ef4970bcf6be378be5edc6e/viposerasejogemitam.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/jejunokakibafeb.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6494aedb---87942804904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=can+a+position+time+graph+have+a+negative+slopePDF 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_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10796 bytes
SHA-256: 4f3fa59e18d01eb8e449a7e97426ab4707880e13b9080055db1f6cd842aed43a
font_01_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 16520 bytes
SHA-256: c2d98bd44b3b740074942665337b4e7c0bf2e42e052e769f1630c0dc1c149d65
font_02_sfnt_off0001438a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1