Malicious PDF — malware analysis report

Static analysis result for SHA-256 035df48b5397ee1b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 19:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b0db56750d93a847e0a947561e7c03d SHA-1: 3df051e71ca9cbe31819c751df33cdb19ce4a0b4 SHA-256: 035df48b5397ee1b7ae383e7dfb2384cb9093bad6bc8eb151c017200a08fe373
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The document body was unreadable, but the heuristics indicate a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=how+to+install+android+apps+on+usb+storage PDF link annotation
    • https://cleartunemonitors.com/ckfinder/userfiles/files/bojofukexubasodu.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/lolamejefimopixotomomu.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tusozadotavatibaganomo.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/buruvakepuselafuruzuvofol.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/2239893831.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161326d41aa3b2---liwubepanudagezejuseva.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/vugituwenaxe.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/numowafugigetapadifadub.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/jumubavoridugafa.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/28123083965.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/dosebim.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/67978632053.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/778d4e40268f92ac21b315315d59e46c/48749461112.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/96a7c928bea349aedf4f6bd43d4f67dc/92892699732.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/9916950398.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/sadepakuroxuzisawaf.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wunikiwusubufazenibe.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/pifunolenasid.pdfIn PDF document text
    • https://seerupit.dk/assens/file/73222622606.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fg0sqrlrkpsbuna7ulpijp8ao1/guxunu.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/keriwofapiwerikageso.pdfIn PDF document text
    • https://aksusu.com/upload/files/74207068367.pdfIn PDF document text
    • https://dacola.com/upload/files/dagetotuniwokibalavosim.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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 10884 bytes
SHA-256: 85e7ad12e5a7bec70695aeda43f0480627785fbc2d58767fb4f6ee5947fa2a90
font_01_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 17084 bytes
SHA-256: bdd2d7fb2a20de167b246de24d9dff6eca1448240df6d124f2153075d494526b
font_02_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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