Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0bdfa19e8bb647…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 07:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4342b8b53b7211243d50b88cadd6a188 SHA-1: 16cfa092689919117ce6fa849db6e13abd20da18 SHA-256: cc0bdfa19e8bb647027b8c9f1f600da1214d1735671d80d2d66c8703c609f705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its embedded URIs align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=cloud+android+os PDF link annotation
    • https://energooptima.hu/upload/File/tigukajuridawuma.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/jufisosibuwizolavoxomijuv.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5mbapve9e2aroafmm70q602ma8/tesekoxuje.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/15494496527.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/nexekiwinojunosigofa.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/nizesudeveda.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/zuduni.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/lelolalemumugorabivarez.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/toxalerivu.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/vadepikorejivorux.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/69745578396.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/pofixuvubagazuzen.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/xesone.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/siganipazetonujebu.pdfIn PDF document text
    • https://successalpha.team/upload/files/makek.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/87562595509.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5ab48b8e---getuteviginufe.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/zujasovotevi.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/64767044923.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/77472765681.pdfIn PDF document text
    • https://mackbeks.com/files/file/85080562515.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/93693479151.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1fc9b9ca6f485a0f49e6d4981e81165c/11368886032.pdfIn PDF document text
    • https://umartravel.com/files/36511150615.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/mabitojotekumedaluxatode.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_off0000bd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 16888 bytes
SHA-256: 61a18768aab5287693dcf9e31d31720b141120e91ca2fd4579f1104f6f1c5c93
font_02_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 10144 bytes
SHA-256: 17329a0b4f5bb19f92363ce970046af87afc49b2b3de07e6532610c42e26ca18

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