Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc72ee0c7e9f2389…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 23:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed9691d78bc089ddb0c59547c836660b SHA-1: 84990acab19ca3aa9d3f3e4538e72be77e600971 SHA-256: bc72ee0c7e9f238985377304d59737f34ecddf665b4ecef3be807193db52f616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or deliver further malware. The primary attack pattern involves luring the user into clicking these links, which could lead to exploitation or credential theft.

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 http://ktcyy.com/ckfinder/userfiles/files/kojado.pdf In PDF document text
    • https://saigonservices.vn/images/uploads/files/77881277622.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/fixeluganafazusiwesutelew.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/lopoxobetewidonureleduru.pdfIn PDF document text
    • https://activepymes.com/pub/file/98766189492.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613430c678d3c---14427513628.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/92028860012.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/43816583604.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/86602267147.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614002d03e798---58236291864.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161459e94bb40a---19618252020.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/kalawuruso.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/645c6fa6b12a8be7ed49c59cd56ad0af/3227995350.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ouf1fe4sh2ts34r5084122830/35737756567.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/65796453777.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/178958362.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/84842341916.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/jutupufakolowosonawajufej.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/20029910575.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c4560dcfdaa5a557addef19453003d46/pojuridugozugaseluj.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/ritameje.pdfIn PDF document text
    • https://moolans.com/uploads/files/39707795034.pdfIn PDF document text
    • http://webmenuplus.com/images/file/29622518326.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0672830f---83341666845.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/73897864288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ios+13+emojis+apkPDF 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_off0000cea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 17564 bytes
SHA-256: 0cdb92afd9c14bc79d5e5af4182fb7e6aae8d87e8eb47a567b7052d878c5ffb7
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 10464 bytes
SHA-256: 3b9a60c15e156031a14f0201ae55009cc3d76489bef4820bcbdddcd8d7aca436
font_02_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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