Malicious PDF — malware analysis report

Static analysis result for SHA-256 278563c580f89f00…

MALICIOUS

PDF

78.6 KB Created: 2021-08-18 17:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c91a0e7a57a09209e068bfd430dc1954 SHA-1: 5c79d361915e6118bf1ad63a73b2ff088ea405ca SHA-256: 278563c580f89f0056e7544e32f311a657d5fa860ab1ade25a8556618463dd67
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://zrdb-drogbud.pl/Upload/file/pifidadawaxog.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160708802450fd---nafanuropi.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210621_421B156F46DD522D.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf3ccf566---75978023347.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f229c5837c258ced75223b831b780715/32347492522.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/jesuguj.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5f1de4a951cd4aa343d7fd68e8a3b4ed/fogaxuzi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i6skbeh9pe28mvujne34ti99g2/lezijakafetib.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/2965702947.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5b08b389ec0010fe2869ec55b87efe00/3174342264.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t9f3bd304125lo0hd65n447kkq/78116729178.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bukajotibu.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/dazimim.pdfIn PDF document text
    • http://hanleyresources.com/images/nazelori.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/nuvitebexomedofotubasegiv.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/96711226091.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/tisuruj.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/853180314.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2467e6aaa1087bae28c8b6fe0e18e725/10377584640.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/34223137061.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/56763004703.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b994bf73f6eabc577d935719f1bbc6b3/fijamazadasiginidev.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/kelunojagavi.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/50177162397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=adverbs+of+frequency+ppt+worksheetPDF 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_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 16324 bytes
SHA-256: df974f38db3229ac8258c592aeaf0fe60c9b9664396f27f603ad754035f270ea
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 11140 bytes
SHA-256: 2f28d18dc7ef07963b5c6ea4ccd7926a060983c964433432fe3234c3a9f1f7ba