Malicious PDF — malware analysis report

Static analysis result for SHA-256 c275eca0368f340d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 09:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 692d1448417dede4c76535f6477d4bb3 SHA-1: 60af7f40c7dd7fb88a574d1d97c6587e43daca3d SHA-256: c275eca0368f340d6bdfddb0cf43c03a750386b5a631a58a49e26bfeb406fdd8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to external URLs hosted on potentially compromised or disposable domains. The presence of multiple external URIs and link farm indicators suggests the primary purpose is to redirect users to malicious content, likely phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=sub4sub+hack+mod+apk+download PDF link annotation
    • http://crocepadrekolbe.it/userfiles/files/51298211404.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/9680378345.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/tasademevatix.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16139fcee34cd6---79951457893.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/48415669968.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/81503849550.pdfIn PDF document text
    • https://grandegroup.net/files/1631930120.pdfIn PDF document text
    • https://posh.hr/files/92778478863.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/10679737892.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/wisalo.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/90033984207.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/pedimonoxologixop.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/19453922726.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/93070002127.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/84765016678.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/41016879256.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37c6d04c3---ketidajolilikewibirofotow.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/56711469970.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/zadupusibikemuwelagoresi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1de95545f5effae2d366551a495e72c3/gufejepasokatuwe.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f2599af36f371e148821ecbd92ec461c/58045609576.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB664 20624 bytes
SHA-256: 05dc188e50952e5335f5fb87e0982e74effb16319b8d72038ea20403b987343b
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 10928 bytes
SHA-256: e8313318778466855fdb3af6e5905d7feaf5172228fc8b98581cf6f757dca600
font_03_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16384 bytes
SHA-256: fd26d661aebada70f2ab211cc9349a88a6b4004e9decbfd97b920bfd045c2c2f

Open this report in the interactive analyzer, or submit your own file for analysis.