Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c6a3c16d5b5f5f…

MALICIOUS

PDF

104.0 KB Created: 2021-09-18 04:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56525d7ee4444a7372f0480bc5f66975 SHA-1: 1892d0ac58bc194910158be54d0985ccc4b4e7e9 SHA-256: b2c6a3c16d5b5f5f768b6e285e748cb669bcbc7e3d05e4af7ec07783de02f75b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pistant.ru/uplcv?utm_term=fifty+shades+freed+full+movie+english+2018 PDF link annotation
    • http://insuralead.com/userfiles/file/52189080765.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wasimikonaronan.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/70301656987.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/95565152681.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/93607613114.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/64334591495.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418bf550679---tonibipezonutegolaxaxapof.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/vivukamebafus.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d2338afc473b6744238f020aadf3bf77/pikobefapaf.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f77bf9e922---16194520083.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/78028745489.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fagosuterobagukepunaxemo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/54874167637.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/kuzavi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1a62fdac1de5d64019ea44ebedf69562/tefip.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/29411484143.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447fd35097d---bikekaradavujuveg.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909122715_148584106.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/47212111601.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/serumexiwitu.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/rijimofujumixefel.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/bafiwikilemip.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc59fe2073---98866004049.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_off00012ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 19260 bytes
SHA-256: d95d55dc60449b53644d4642218cd124b16d8a5c2cc689357750004e58b28b8d
font_01_sfnt_off00016058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001786f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1786F 11560 bytes
SHA-256: a54fd09a02bd38b08b150d9a0ffa9545f7c2d91e869b971f80c6822d78e1692a