Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0fe032b63f5dd3…

MALICIOUS

PDF

104.5 KB Created: 2021-09-07 02:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01221eb6e0d6f3fa3f861a153c226020 SHA-1: 61999ef3fa8d09cd748ce8927dd7067afef04abf SHA-256: 8a0fe032b63f5dd3f096ad91df19734bee9ca5c6e7ca415c1c49ded8b6bfb378
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, indicates a link farm designed to obscure the ultimate destination and evade detection. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.leposeur.fr/site/upload/ckfinder/files/mipogiguzefa.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/grbo3mavtld1lj75ruflp15vug/tuxevewi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ro3j5ufec03ta3qgbpmqtpe9hl/68978187780.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/26b6dd2e9471c99c9254066ac0ed4f0e/45956848677.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/46303553165.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5a2d91fd0695fae6ef4da1958b7de980/kamakiladikubawakos.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efe5cbb63c---41275797004.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/44998594212.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/topup.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a221c064d1c---pebum.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/57557050986.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/55863520803.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073470f64dad---vojuba.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/bidipaxumem.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/43660997082.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/futim.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16119577d7d4a3---30821399240.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/86664294160.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/fuvamudubakomibajanamim.pdfIn PDF document text
    • http://iccarrentals.com/files/file/tumazutirigo.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/45660012505.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4f134882---matuvura.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/48938313242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=algebra+regents+practice+pdfPDF 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_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000148dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 10796 bytes
SHA-256: 411ae19fd32f5de877c12b58fc28fff33adbc319114456c8b51e49188d033146
font_02_sfnt_off0001616d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1616D 19492 bytes
SHA-256: af175310b6a599918641e813092bf19a60faa832a6974f6decfa101eb2cff896