Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d8fa87cf69b654…

MALICIOUS

PDF

97.6 KB Created: 2021-07-04 08:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30b66ff5b8b89cd9d1f90b0c37668c6b SHA-1: 6a030a65e30845c010e2e44082e6c6f00f25bf35 SHA-256: a6d8fa87cf69b65449562c5e55203610d9e9037112a3dae327d82f8ab5dd7ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are indicative of a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=fear+of+fish+phobia PDF link annotation
    • http://sskj.pl/userfiles/file/43796217500.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/zusunikogefej.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad1755806---movalugobifuka.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/tademezegobaxaxir.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/43729947263.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d5b9793e436efc7bb2fec6ecd4cf0fd6/50076501165.pdfIn PDF document text
    • https://bio86.net/fichiers/76467167092.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/88514804652.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/68742781834.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/16506577804.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/ganafetefurajesimuz.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92175b989---vijewigib.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/doxidadosubu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075f40898450---jafipa.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/reneru.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/16589882092.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/cq5usvkb0aq07grtc6brbhcc4m/rusibudejurikiworugezij.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/eb9aee7523a26581cb73776ccfc57a3d/soruxekaxemiguworarap.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a42a33f5---tuvetalusu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5740d09d---3031289954.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/zojotabuvel.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s2i9a5jttdg3qdudf5qd9112m3/7007484345.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7814c5f71---bugudegifuxumurafut.pdfIn PDF document text
    • 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_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 10324 bytes
SHA-256: 12c6a935f82fd86b384c0031f8bf97f4a1242509107b6cc8c26f4c6c51f4c5aa
font_02_sfnt_off00014e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E11 16696 bytes
SHA-256: a78653d313f93cc543eb9a90d3b08d23652598e8852146059b31b0fe0846030d

Open this report in the interactive analyzer, or submit your own file for analysis.