Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc86ded2c6f63f9a…

MALICIOUS

PDF

97.7 KB Created: 2021-07-27 21:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc736f9960a6286475c2be370791bba0 SHA-1: f35a65d43d63d257ca5a175a41fc515b42c82778 SHA-256: fc86ded2c6f63f9afbd76287be2f1f3e43e91331a0566156d92465f0026c22dd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2hhmnabllgkbn9c2c79ovpmf7a/50177239228.pdf In PDF document text
    • https://ratsimae.eemedia/contents/file/mudapujajol.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/xakivivivanixel.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/39736769406.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cada2b8af---nedam.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/58770347418.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/36q21qi3v7ongud7v4oaivm9ih/nuvobukasasos.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/sezaxazanesaxajajemovele.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hp9tli1b8t3k9fpvc7f8to8c35/xodevivarananebam.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9a06f390d6642fad9c31541167670ffa/82071982902.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070261b9a5ea---24308698128.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//7758156508.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/726830e3195a25ce32a96429464e44c1/werogukotinatumutone.pdfIn PDF document text
    • http://anm-av.de/uploads/files/34041385259.pdfIn PDF document text
    • https://soechi.net/userfiles/file/86039317945.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086557047452---gaburofekagaj.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/tuwutotulimazewumuno.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/12147439618.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/19063977436.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/83370ea6d3e276af480eb06e76bd55f9/pidafalerejixineliboduj.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e47e9702---21193814496.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f4ccb087a06ebe88012e2e170a0a07b/61413267419.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nupeberojorujiraravuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=thinking+in+true+conceptsPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 10600 bytes
SHA-256: 407b469866593822d0ce373843e1a2c525c65d4584aff67ebef8536662571594
font_02_sfnt_off00014d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D02 16668 bytes
SHA-256: b4dd6f45a89f40165d44a60cb5eb25bd9a966c8b67a54caf18bfb7066b1480a3

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