Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd61478a1e2c460a…

MALICIOUS

PDF

138.5 KB Created: 2021-07-08 20:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2cb6af3c0aff7b7696da8df7c1619ac7 SHA-1: 7f9b3f1bef09e984b537a75eb134f78d4b3aef8e SHA-256: fd61478a1e2c460a0862eeeceb81bb5a305e4aea2fdb22ffdb193c939d2340ff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. These URLs are likely intended to lure users to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90ed31df1---muwobiwapegajupugovoja.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e7720818---megebobaxowanu.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/49100819326.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c5aa8e7643f63f3ea7e57f2b178664d/44300568608.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/91826296467.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9064ae907---sogutepubolawafanup.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074d31ee9916---95434364313.pdfIn PDF document text
    • http://schokozentrale.de/idata/10730820170.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086ade02b9e3---58664243525.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/edfa66812ebf9c82a74a1cb9929e1ed1/51683192448.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/27980653690.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a35b9b13ce70904a1ac34927cdeb439b/62892386581.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ogd8k7b3hv2u8q4kb9tt3hoie3/61262914043.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b154bd317d3---63393550898.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/37914412569.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/79626679622.pdfIn PDF document text
    • http://maihome.hu/admin1/file/46089896006.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094add7a37ed---49770789159.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c496f7a7632---fuvufexobawelaliwelizus.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce26b566dc---denex.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/bafineromevizabowuvawulul.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o9bb8eg9m2fcmi0c7irpnv3mk0/nadizevefikosenemagevumax.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pizurilumutezigurotilus.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fs0hjuauemj8jr6beak0j8lnos/mikopukodimisujeser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+cribbage+board+plansPDF 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_off0001b909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B909 19896 bytes
SHA-256: 94c4b15671050e35e36baa7e501c34af10e3f89e0aed222a03d3fea020258ddc
font_01_sfnt_off0001ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC6E 10708 bytes
SHA-256: 7602f8bbc1db87a74144725bff671ec6648cb62c17fd5db896345d308d4f97f5
font_02_sfnt_off0002049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2049D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1