Malicious PDF — malware analysis report

Static analysis result for SHA-256 e523bd10ae45a6e3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-03 17:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 825a67d47fedac5e883302e911048d98 SHA-1: bec152d55dc95b50aec21d8ac5ff0260ee05dd05 SHA-256: e523bd10ae45a6e3057e890caf6fde1455762614c5ef2fb3f88ff6b880692f7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=partitura+para+elisa+pdf PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84339bb90---99203331068.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/pefepe.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/43599156135.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/65194834045.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210818_C0A8160FE5634BB6.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/81230022132.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad784c394c---xudologax.pdfIn PDF document text
    • http://sparkpro.lv/content/file/duwegufiduzufijunojivedi.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/84809354195.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/4826816316.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/14101514012.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/072291ead2ce64d77e21490b77ccba91/suzip.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/zewinuxujasexekuravej.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/tepaporexira.pdfIn PDF document text
    • http://coffee33.ru/archive/file/57537892702.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/suxex.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/97076866882.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/85823559383.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rd36bfl9rkki54q0c55tu3o7br/wixonosanasan.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8c9e0c151---fejemim.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/saxanudoni.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276975321b---711176813.pdfIn PDF document text
    • https://eternalbliss.net/file/vixibubifiwapesujika.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/kedojosixuwuxi.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0b17456ad68f723bcad9064986d2a319/vibunazutubetirekomuz.pdfIn PDF document text
    • https://polandpools.com/contents/files/pirax.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6de820e930e3587cc4ac9f08ab34ec67/28879059480.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efd23e06d---wexafalevim.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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 20912 bytes
SHA-256: db96fea7223c0278317cd7818310124e64306894cd1aca6097560912df931d74
font_02_sfnt_off00013900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13900 10368 bytes
SHA-256: 4f4e8da631ac128030b90912967d075c3ffb5300b8322b5e25c23b6f80e31c33

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