Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac8b6d0966ab524…

MALICIOUS

PDF

91.0 KB Created: 2021-07-13 06:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6de42f645b9ff174f39337e70de25b4d SHA-1: ad4f5526eb45a12a3adcc1c401094d3c1c4eef1f SHA-256: bac8b6d0966ab5248f9dea55ea9396736bab685cb01ac1b2c1150b6d30e6e7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://cructi.ru/uplcv?utm_term=chime+in+sentence PDF link annotation
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/gutaburep.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/vagalupumadobalunasixowa.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///morevurevitoxigetazufe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e443d7d01e0b445bc6609a4d81451278/4920499128.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e7638611463cbb9800f1c30036a81a6/74447563851.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/jagekewas.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c4543a0---71073508627.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5e518ef1a387c21fd034fcd7cdeaed63/61961400448.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/gibuxixanafumabe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515735228b---79834461230.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4bc329999bb061552fa6c0ca1eaa1a52/3462995489.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/icr6ug161jcoifhnjr1omgq91m/78576616843.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/e8oct6ajqlnc3pfb7kpj50dc9p/66767657648.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bipob.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a634413f---tamin.pdfIn PDF document text
    • http://www.toptehnik.si/images/fimimijifilet.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/robeb.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/999542b2095c56dab2860c4bc643d959/19577804110.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/abcnlqq0llh2mi88jmctrf8a76/56769744685.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6504fbfe---11353988133.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/56279695769.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ad14eb272a5b419e0e48bc8091aa9a13/89488216055.pdfIn PDF document text
    • https://tavio.ru/files/file/63815866821.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8706ec32e---wosiwopaladenin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 19312 bytes
SHA-256: 4e555fdd5639b6c46fdc8a487d6aff6698253f5a6aa11172178f65059bb81ef8
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 16396 bytes
SHA-256: 0a1bde1a6de1339ac9fd28f83d4d904022ff5cce4a728d5f3aad20b543e6b4b6
font_03_sfnt_off00014803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14803 10096 bytes
SHA-256: 82388620b2d4eeff0ff6346af08ea511fb60af4d0aea81b808726b40578f3568

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