Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d78fc347114b104…

MALICIOUS

PDF

96.8 KB Created: 2021-09-03 14:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32aa557d6de6a1aa25e518fd56cc961f SHA-1: 8ae026bde8e0848e4299fa190cc40849caec04e4 SHA-256: 7d78fc347114b104c1fb9f5b27a16f0bdebde6140e3ac1655e136594f20d4f35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and a link farm pointing to multiple compromised or disposable hosting sites, suggesting it's designed to redirect users to malicious content. The primary goal appears to be directing users to external URLs for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/1111984828.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beff07e40d8---vetatoz.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/ravedisepiwijebutiz.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c8f755e4560732fe3f7d0080c782c9bb/60329701987.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160975ac989280---52829488089.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/80424221495.pdfIn PDF document text
    • http://slsnn.ru/content/file/83489724836.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104dcf73b226---nasifusox.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/3346058838.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/xaturetakabefa.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/64c0beb6ed3880a852ece50ca6d5c07a/vasaxoredakonugajeze.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/91209438251.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/nenesebefika.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1151db720ad33a3da621d4c1f10fada9/sunatijusivogitabupinuge.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65c619ddb---rogabufutisejepilinita.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/nudovogokiguro.pdfIn PDF document text
    • http://gptools.net/userfiles/file/60133758263.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/tefetakubelodixetevumulig.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/55981379456.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/44873740801.pdfIn PDF document text
    • http://capri.lt/userfiles/files/zoxikapuxorajitufanez.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161273dce2dee0---jasokitexazuwugagixarop.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f1bbfd955117a7b82fcfa6d21c49c912/guziba.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/togawadofavotiviwena.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210822081319.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b249bd61879---lewupenizapemekifuzuxopo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1212d503e89f182279ff99073ee03da9/83246159078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=amiri+baraka+books+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_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 19104 bytes
SHA-256: a4082118e1525bbfe7cc2aa007e788d94f5d8982f2288e5180b66e99d5e89472
font_01_sfnt_off0001455f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455F 10492 bytes
SHA-256: 9138c4e5d27309bef5852a95de0f37349af2628879c739f11604e79798c34e3d
font_02_sfnt_off00015cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1