Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c92e53c8c8d0bc2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 839a942092b26a27d4555716d868261b SHA-1: 5218554de619487f368b58b0d4ecff0dc52c497e SHA-256: 5c92e53c8c8d0bc29279c7d6aab9f8a861faa4f049ff4c80a0985d729e7bc4ff
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the PDF containing a link farm pointing to compromised WordPress sites and an IP address, suggesting it's used to redirect users to malicious content. The document body is unreadable, but the presence of numerous external URIs and compromised upload links strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/38b02283b17ccbd914fa9fad605e9ab7/9458154003.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9bd5c711f7b294133480dbed6587625e/banugexidoge.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/96500427625.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160feeeec5c872---babipotubatuwajefug.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/13663061321.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9dec5f23c---bokazobolipobeb.pdfPDF link annotation
    • https://lesura.net/userfiles/file/vemiwapivamazivokiz.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9394e79b2---lugatisowizeno.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd51e1d54c---2909578120.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8140a84bb5---nefar.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/67071699831.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/67e1aec8c29cbc0d5d948bb6410081f0/14621810150.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/90706355191.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/felowuf.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608780a173397---gajefoxanajupimuliluk.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d83967ce6---36225004984.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/fibozapivumitemaviron.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/ponug.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/96382961136.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/pigugagefufiwatipunak.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161346597cd7e9---soliliboxosafawef.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9efba612b---wepepimopagipabobu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/oajrtnggub3td5bou60fd45u22/11981100133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=python+pandas+read+excel+worksheetPDF 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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 17808 bytes
SHA-256: 4db4d76bfff46bd66928dea8fe766c9d49767f99e7a81cbc28de57b376340531
font_01_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 10912 bytes
SHA-256: 4b50c34c7ec9404bb7d01ca419d7f0fb4cf8f8f2e6fef7b86b306e52d6f03de6

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