Malicious PDF — malware analysis report

Static analysis result for SHA-256 951b6c29ed1ab4bb…

MALICIOUS

PDF

83.0 KB Created: 2021-08-20 15:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86aaef0c2bc8da6a0ff310fd15a7a2a3 SHA-1: 2f0bfbcf1d4e5df243d034bd15a6b0589f8b62b4 SHA-256: 951b6c29ed1ab4bb04cbc8dc5466f2f4d4eab20b6ccf9a9b234da34acf70d548
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://wastran.ru/uplcv?utm_term=how+can+i+help+my+stuttering+child PDF link annotation
    • https://sahodayabbsr.com/test/fckeditor/file/9673392844.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/3747655318.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/ludekivonevele.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f995b6f69---mubumod.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/momuson.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/danapowalegapabadukip.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/98721777926.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fdcbbb2b3---16852846483.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4b5560b53517089da4a575b01f753ebf/forajuzotexedexinetejor.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qlmptpno59le9dt4qh4i7o77ma/73893613328.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/pukisavivigipuxifasutopi.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/desekadovixa.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/58741134922.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00b61c002---zeveb.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d1213d1cb88d7c1ed4dc843bbc012adc/57959579215.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/70462842835.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/85120880248.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/neritemumomikakilezinataz.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b32fff86f322e749ae9d7168da4acdee/56801002854.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/66435612948.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/nisukadedovolivebexalinuz.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/duwepipomebodokumoji.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec2062181---puzijonimoxefixenap.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c1cbbb37b09f4536ffd589b0544e6adb/noziniruxixigosu.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fepivugexepafujiduxajo.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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 11252 bytes
SHA-256: 69d4e7937763a4401697445b8bd1925625c4d16cf64975cec2f73ebc0c2133ec
font_02_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 16264 bytes
SHA-256: 0fcc0143c098a694c6b8d2f7b69d1bca9c36fe0e4d75069401a0620b9758e0d0

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