Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6d6ceb0fed9f00…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 12:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 04e24e871bd82056af995cd07f6e3bc2 SHA-1: 1be9dc67fd0345345184c85d149f60ac8d1335ec SHA-256: 9f6d6ceb0fed9f000847e9ae4299903b3f20791d39124cae97f3fe7ade3202b2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The presence of these URLs suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=android+studio+output+to+console PDF link annotation
    • http://emrc.ie/upload/imagecontent/file/585566706.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471d171b476---gosudabidasuputeronuw.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210904095523.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090417542466804.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/87285010990.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/fonarupinuv.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/kanak.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4ff0083e3007b565539d4c75c992b326/zivajakugatakakinuko.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/14227146057.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/fulofavefapibe.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc94a7f22---ximobadazoderotodusu.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/muniba.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/66709045347.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/vivaloju.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/romuvozevipuweluz.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/sizoxiradupujawax.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/puralivomifop.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/duxetuniboguxafabadefix.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/25721108384.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/12657270570.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/65493280429.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142b44ac33a8---fototuzarenab.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/tududeguramofuvaka.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_off0000b395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 17828 bytes
SHA-256: 44880ebf8c3a9583f36a2e18227fc1cb47f0170c028a8aa4a4be5faa7651c2b3
font_02_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 10424 bytes
SHA-256: c105d16f4905ec5f97c8fc01c20b60eb35fe40f593cfcaf36555c249231975fb

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