Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa0312752ee54fa…

MALICIOUS

PDF

85.6 KB Created: 2021-08-31 10:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c65194a20a7ac47e6592d0a169688f3 SHA-1: 04e5f5b13260a2c177302e5504d59a7152948ef2 SHA-256: baa0312752ee54fa62f2960ebded3db6704c30b02622b8b81bbb63da7d2ccbce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. This pattern is commonly used to obscure the ultimate destination and distribute phishing lures or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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/213d6082cdce2a0a083a1a5be016c715/74325896321.pdf In PDF document text
    • http://pwmtqatar.net/userfiles/file/225704313.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5768071bad9e67bbff1d1c74561d8ff5/nilezagofuninev.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/fesav.pdfIn PDF document text
    • http://haphadoor.com/upload/files/timufuxofewur.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/43039f5015ef90bd241bfc2c9fb97bd3/39295267484.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/23979516361.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/sozerulipedejufumiro.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/medewositadud.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a777f8e69ad---sorusofegubopesuxofe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e4dd995ff09266a75e680025a1ea345f/lilafipebumobiluminiwof.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/ganukegu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/63395653541.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a7cc5ce51197140814baa730f4a40613/minutelonejinas.pdfIn PDF document text
    • http://songhungthuan.com/upload/files/disero.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/ninawofat.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e536cb22a---99009705652.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/xamov.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/44774983653.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jogemikix.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d148f722---71889197194.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f275ad971cae95bc0703cbebefd68862/wurupatobunolajusobusow.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/wimepapokavuxebeporerafif.pdfIn PDF document text
    • http://minerva-collection.net/files/files/dinowafanajimapaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=period+pains+but+no+period+could+i+be+pregnantPDF 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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 10932 bytes
SHA-256: b745457f9140658ab385c6cc33a8418be5d1241dfbf9ef5eaf9c92b190c55697
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 17592 bytes
SHA-256: 7cc2fd690458f3120cfd1c8a97fcbb5b74792126f20ad781fdc02c2c37bd8b5c
font_02_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1