Malicious PDF — malware analysis report

Static analysis result for SHA-256 1367736c67e326a0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 23:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a8bb4b3085c7c3b11acaca54a7087e1 SHA-1: 13a2e2d5815690e038b08e95bdc1d0dc3ffe3573 SHA-256: 1367736c67e326a0f18de402cb29a5dce4892827a2a1a5b2d918db395c206df9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdad1ea53f4---78628099212.pdf In PDF document text
    • http://stigstudiotecnico.it/userfiles/files/saxubezojin.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/govovo.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/72237955452.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/jezusajozas.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kbaedk2idbu60l4hpvmgschfli/82375826904.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/5337751378.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/37846438428.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f1814864---verejatuliwizu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609005a822c17---miwubebidibiw.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/vujot.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/kujufujupalenaw.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a0eb9c33f6---94267916379.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/ziwagupazup.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/dowenalelexegirafiz.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/32354553067.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/nufevojowevovub.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b732ec5bb---bekamosagek.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/karugob.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0312c7d1c1a6ec55b73d6a2119584c61/76094417632.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/mulemi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6g5oivvmik3jle3831ha9k25d3/nigojeromizotokajogamez.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/genosudewoguvasuduzen.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fdfc260c64dbdb56a23f9334ec46e80e/lesakisilugusimet.pdfIn PDF document text
    • http://primaneighbors.com/userimages/verazosikowat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=international+accounting+standard+38+pdfPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 11228 bytes
SHA-256: abc9b5b49f989c00d1db549e8414fbe88a9347c6c3f8dade51a97a112ba69d33
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16992 bytes
SHA-256: 8c725ae038abb03fdf6d9ea65526f35accb0044a42017442bfc9e6ef623c1543
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1