Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ac63c88092bd48…

MALICIOUS

PDF

85.1 KB Created: 2021-07-04 06:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5f259bd31744d5ac44ae6c0c00707e8 SHA-1: e6c390cb71cfff4b5c6030ee1c32951649e1fcf6 SHA-256: 83ac63c88092bd48ce10438f99e41017ebc2c15c2e2ec00358bcd9029e8a132d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://kamnitikamini.si/upload/files/pewemumepilezopi.pdf In PDF document text
    • http://ks4073.com/file_media/file_image/file/modikoluluvefemi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0d43175ff1898dcd3ea766c34cbc5a53/17045032522.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48ec22c11---vukavofuv.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/58933030157.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/fifip.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/56236645438.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/femikuwuperugafukaketu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e57b0347c1---34398876464.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/konapedov.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088291499b07---8944595621.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb544cb84---76590313057.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/worozuvatuwagarex.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/574885a7f04ffe250697f5a3ab2dafff/83078856814.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084688c0bcd5---87984846345.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/99929621011.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857adadc322---mozokofoduxeja.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/65965520933.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608291d4bdf50---43355187199.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a9fb1fc1d---neloruzetibivitizefot.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jewurozapunifosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+great+gatsby+lesson+2+handout+4+answersPDF 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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 11036 bytes
SHA-256: d463e3a4141ecd3c7bcfe86ffadc6a0aaf4d0b8c222824c396264e7ee77093a0
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 16840 bytes
SHA-256: e40048d47fb7358200ad7524ce764c7dc1a78453e451bca03a97c7a75580bd86

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