Malicious PDF — malware analysis report

Static analysis result for SHA-256 a506a486c552faf0…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 05:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 856af467fb74f292f36eb60f38e7af06 SHA-1: c8c7070f061680032b8b139f1479434ac3cbedfe SHA-256: a506a486c552faf09661ec8713b95f36b939aba6c2d0170469b2b8c42c66c692
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/o4q5krugaje8r9sjlum2ojuljc/42770680011.pdf In PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/40880941648.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c9cd01152d586618a848cb542e2bdaae/difolus.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7u6anecfdu6quic69jrh80g8c3/79710897608.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/27187359118.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/wosoxeberonavujali.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd3442c55---86098002077.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/polukuxokujekimigubikudel.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/96140131139.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c21451750---bezijut.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744caea3675---41763706420.pdfIn PDF document text
    • https://vientangluc.com/upload/files/54195507065.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609229ee97474---riwonosizubirotiv.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/25532609966.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/mafivodawar.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624078635.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ek33fk0jdhs3c57t221n4bqrvh/3647616410.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50496ce650---mewibuligetigamawax.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/aa655412fa7e6f949dec361832cae31a/43677407686.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/77254764228.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/57251497102.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/89403580114.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/9sbln08bk87qbupum42kaef2ms/15846027593.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vewoxulewemuzojojewenajij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=two+toed+and+three+toed+slothsPDF 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_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 10304 bytes
SHA-256: fa87a1dd1cb088ac2d45780652c67a5f6b151e7d123b9dc6e5a8618c8b7e9ae2
font_01_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 19272 bytes
SHA-256: f36390dc2d6c3756de5f44c3e2db4ef9e569afbcf39fe1cc80aef9c2ae70c6ed
font_02_sfnt_off00015a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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