Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9a03010307cfa0…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 22:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0166bde0be0367baf17134965d24a267 SHA-1: 6e48f2964fc986d2b542d3845b38703d0b37c959 SHA-256: 6c9a03010307cfa05acca36895481fca39dac4c1b569b85abaed27cf9418e374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/238b177bb1d12d1b6d28d45c40402763/92141989585.pdf In PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/zeran.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/28820197368.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/84665463656.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/ruwipofekipamoruxod.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/rofewovumojivus.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e723494e---woronipimaletipute.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e373ecacc71c7d28052a5f611ca2ffee/7114299404.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vatuvalosurudovozipofopil.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210822230744344.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/859a3518c977d78865d649ba91901dd5/80445377142.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jizazupa.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/vopalo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16124894387625---legagujog.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5rp2giccqntrfmmp8ae33qrgt0/zamunifumufapowimedin.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34803808062.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af5cc9c02---64984874596.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/41928240839.pdfIn PDF document text
    • http://artepcb.com/upload/files/13213176591.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/notux.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608098fbbbee6---69767921500.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/39878152375.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/19940340657.pdfIn PDF document text
    • http://irollee.com/userfiles/file/41724763125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sysmex+xn+350+manual+pdfPDF link annotation
    • 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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 17644 bytes
SHA-256: eb7cc35ce315ecb98da3fbfa34f2984a3736c2ba58562225ce4044ec3ae5fcaa
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 11068 bytes
SHA-256: 2e90c637780c696cbf6407d543e9f3cd6f9fc663ec46f852b7cea3152856f276
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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