Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80de6d56ae28d23…

MALICIOUS

PDF

75.4 KB Created: 2021-06-18 14:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c9bddb1b0c7899d8e684c6e8ea75429b SHA-1: 57f26f87fa47ed056de3df3897d8a3c9ac70e0d8 SHA-256: c80de6d56ae28d2308252c11d301a66267e1de9c73c5d6ec127ac8083a2d37e5
156 Risk Score

Malware Insights

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

This PDF document contains multiple links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The primary lure uses a popular game update title to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://chcial.ru/uplcv?utm_term=minecraft+1.16+nether+update+apk+download+pe PDF link annotation
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acb2a5e1f1a---wurupegemalivofi.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/verlijue6jtrf9spe0k96l9nf1/saponazabefobuja.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8e9d5887b2ce778e8df90ec2473de376/tizanumuzefagoxebob.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160866a31138ba---82518559221.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/58qak9h040g2sbf3uh1p0d3607/fasimaxukafokimo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc1c00245---61292894087.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/c3b3633d39a89e29aba41d4b0f1e2d32/kekopekojuzav.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8d29b6fb209125bbd132ade333744747/85084878161.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f25f3cb1c---karewetemopus.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/af16293e9136ef8489b785fca3af4431/21870839196.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074845d59a19---labekudovuxigul.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/nitobosejafewo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/loponunud.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6b12c00d571f35e1564187858d3951c6/61486302379.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa80898e1---pifazafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5464 bytes
SHA-256: 8288b011756d2042bbec1535e75bca189969b8cc972757890612f63925a382de
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 10724 bytes
SHA-256: b5802c888455f6cd83e7a720430fad5ed94a4a67f8659b68ed8412290e05573a

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