Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf366fde4592136b…

MALICIOUS

PDF

93.1 KB Created: 2021-06-25 23:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 432dba3f6ce50b929760fd2f3c7a7b19 SHA-1: ad17a41dc61bb914dcb91db916f36c95ab19d2e0 SHA-256: bf366fde4592136baba3e2ad308b898a5b5d61f0ad7845418c4f18950ad031ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown PDF files hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a link farm, possibly for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h9h5rlpfjvnq4a2ovkdvlp9fvi/6590192962.pdf In PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/xelumusi.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/73880671867.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/21l0iuu0d0dc31b1srceesiv55/folevumoxoxir.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/99210321355.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/pokikonerap.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e695479---74343741182.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56b3f2952---tedososuzamitagu.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/notole.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/pigavosa.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/926851eff60dab86a999934ebe3eb3e0/9199443717.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/67261773461.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e2096d2a---20468878179.pdfIn PDF document text
    • http://naucseto.cz/storage/26723464639.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/tivebomitetabusametuwe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160855db4f1a9f---13023737373.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/77241939350.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088dbc599719---menalurosirasovo.pdfIn PDF document text
    • https://serka.com/serka/upload/files/wosulep.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4c41760b060042de923e3032c70d8ac2/letabi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/293eb6f4da9ee869deced4ae1318d008/65538581206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dead+or+alive+quiz+questions+and+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_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 10700 bytes
SHA-256: 6e4086992be585ef2905d350b0f4d22387b1841ec0706ac34d96adf6ebddc8c0
font_01_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16684 bytes
SHA-256: 909a185d90dfa188b945e42417d1647d75cb87df79bde119131b346e17180605
font_02_sfnt_off00014d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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