Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8ac55e725bd593…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 13:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0440e579236b1b3ec36a73e60c155b03 SHA-1: 2746bcd877899d1cc30b6fefbe639cf754b7616f SHA-256: db8ac55e725bd593e8409c68e0b9365fe1e5c95b0aaba28d28df98f4d1d476c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bebcd49461c67ed994976fd2c7bfc797/dedugutenusegizodan.pdf In PDF document text
    • https://cardion.dk/gfx/fckimages/file/xemobajavapopajolos.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/oqmla8a00knn4h8gd0qaon36u2/7315366850.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/napiwomafomodajunigo.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/zukasidobawuzi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e12eff55---11149631768.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/63114488636.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kegulujusawenikejamazitu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca382bbafe5---81403154926.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/62703585147.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc4a2069a1---35637940814.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c29ddc8efc2---65814570208.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea059d492---rowukegeminuwufegupexap.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b64a41d8a4a5118850fa4c4a0f6a0f5c/wodokidenezafozaj.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4fed413c09bb51b25c512523854f077c/75551880736.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/bofaraguvigulobabi.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/98338692500.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c29bca93f64---28282686197.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c520f22413---46362180583.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/wajimusimofuf.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/78511460741.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f09ead75c01295b25e0b46e3d63acb8d/51581809007.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903e909d5b3---zitibibamo.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/videribulebonaz.pdfIn PDF document text
    • https://rjpexport.com/files/tatebapomumedeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dhoby+ghaut+to+clarke+quayPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/98a9a7fdbc666aae639f0677c5f35e46/tetap.pdfIn PDF document text
    • 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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10736 bytes
SHA-256: 4e9228bfad9b7c31bd53b2e2b390735d01829d898cd12796ea4c69d7a1b993b8
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 19740 bytes
SHA-256: 5feb8aedb3c8df166a46b8b0afe075e4200b5c2c458323b5e1338a6f1274e78c
font_02_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.