Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc720d9f95a3534…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 06:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f80ab9c58723f3255cdb922a31a6f18e SHA-1: 85bf2e8c7e1b7dc546ca5d30a3b6001a9e3dc045 SHA-256: 8cc720d9f95a3534b41fe21ab14bd6f726da9ea648a43e293aef7cfde95d1c8e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains, likely as part of a phishing or malware distribution scheme. The presence of numerous links and the use of compromised infrastructure suggest a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a8997c2ef---17890070980.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/524db0cfaaf6beb83c2e148e4a66f4ca/wejedodabapilabagidudu.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ue93755j1bnlm5i7o9i47ldqo1/55235795054.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/90014bb5d042583b51ca31d685f3e0c2/wobuxonujedurize.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2be3831f913f36af114a50c52e994ba2/9265650409.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/24329051280.pdf
    • http://atut-biuro.com/uploaded/file/zamuxi.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/28498d7625f55b2f8ea433a42b96ca31/18785195790.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99218a1b8---87778420882.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f3b0ce6281614604c4d466f8cbc36722/56151567515.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080d26deaf81---36966944365.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ed42da92---fiwikoji.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cdcd53e9e---42848437096.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1695844e9a46d6fcf0f656c5676617e2/zadetofulevaj.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff3b6177c---xokizudagowufu.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b968dfd68---4654664504.pdf
    • http://accessiblevehicleservices.com/userfiles/file/8223464755.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ae60fe9c2b4efb1dcaa976191e273bae/xalagi.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093b82960661---tevafom.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1b6c1ac7---midag.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/7072626494.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9ad04da3---pifosapegebos.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ce63129d00ab34ff452ffb08c6e556a7/puvix.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/50bcbd6fe100f59dbae85403f3a8bcb0/47522036420.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9d60563102f4d2ac7dd40cc471d0dfdd/11435244411.pdf
    • http://brlairport.com/images/file/69179977183.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+300+rise+of+empire+free+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f625.bin
441488c1289e0b9f1b35cf1bc001cf060e2e8edf1424a3ba07d0085afb9234f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 11032 bytes
font_01_sfnt_off00010fb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 16792 bytes
font_02_sfnt_off000127c9.bin
d06dbd14a77f35b4b75b7126e75c61bd050e38b608ab39512e02c163d33d69fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 17600 bytes