Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77ef13faa34331a…

MALICIOUS

PDF

87.9 KB Created: 2021-07-14 04:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0e48947d37589e37ae1fa54af64d2eb SHA-1: 701fb2aca91b48479de5c7cb77190ec15eb9517b SHA-256: f77ef13faa34331a0890dbb455cccca22f8bbe0470737ec9b9d248e0eb836eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fcb95953149a1da721830a5fff729372/fodozevutexolujevibezinu.pdf In PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/28437750253.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/84629213111.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/16620191622c11abfc365f561ce0ab8e/38116106896.pdfIn PDF document text
    • http://jkohut.pl/file/vepabesepitafodetij.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/3781900429.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/99586554eb92190536ab5403472eebb2/bosawumesamaze.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085195bbdce2---debop.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/romaxememarig.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/43957879012.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/23011572418.pdfIn PDF document text
    • http://mav-auto.ru/images/file/91895829245.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kmhmda4bsl9bmu37vun0g7nn01/dilututowapetejeponid.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5qvvvrieco90dijblbpqjlrr54/9587129975.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/8145599140.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/tcl89qqagfqhe3qem4tlfv84gv/pepupamelevejowavoninafaw.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ogdf8iqc7moq3r2grirkec9dr4/buwegadokagajuluda.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/282031426676.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/875b5b480beac36a2be32ebea691ceec/48157487110.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d097df11df---tajoj.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/76510558591.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/19119944582.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/kefegorerubojefes.pdfIn PDF document text
    • http://coffee33.ru/archive/file/53776740003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=video+call+without+appPDF 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 10392 bytes
SHA-256: 14c47aefc37235666ae29cebb4b056e6f1c9cfa8bbfbb3f813d02cd6b263d9de
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 16792 bytes
SHA-256: 9d15e63df5045e32815df114c76b9bb88eeae1963ba77f05a682648400af2f75