Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b690a7fc133c0ec…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 02:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54924e87acab106c074400a52970dac7 SHA-1: 1b0688f5afc1496e53c09f1870d34e99bc2196f8 SHA-256: 8b690a7fc133c0ecef19f68b613c658eaed4e59afc3b50a9afc8f5bc3746fbfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://crewmak.ru/uplcv?utm_term=cyberlink+pro+apk PDF link annotation
    • http://maxbrio.kr/files/files/31127009920.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/97184463547.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/79034621128.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/vojesabe.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/79356603048.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/v268mr036hnn873hvq4kg6fvr0/divazag.pdfIn PDF document text
    • http://annabarons.com/files/files/gamanipupu.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/75546765131.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/53499386491.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/zinexafi.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/tiladeb.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee097b19cd---98514626246.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/wijokovir.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40433668600.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/30772243426.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/mopojefub.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fizuguguwinobibujafeke.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5ff39125---guxunaw.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jogurome.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kilafetak.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/7250020987.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tuvizinini.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/85058011354.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/tajomezirufubuzonadi.pdfIn PDF document text
    • https://sinarwaja.com/account/files/nejoxizobupije.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/31395296709.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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 16628 bytes
SHA-256: b91a2077b35b1c2cb653658e6c68d5e30b776b68eb25d6e8085d09d46500fc16
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 10356 bytes
SHA-256: 93ab60e0e306a48d976e336dc3c84cfb62b0fa6f893b7c91be1176b4ea244f84
font_02_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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