Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fc60a182e36300…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7fa3fee5797789720ff68605d0023b9 SHA-1: 3f656c1f4edcd56b1ca5bae116c09788265f8393 SHA-256: 97fc60a182e36300cad24a3f0a4f5119a78d8634fed7750bebd1e40e409a7704
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 http://airholic.com/UpFiles/WebEditorFiles/file/80569343906.pdf In PDF document text
    • https://searchlink.org/userfiles//file/xameweguwiwoburejosu.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kimawinovozitutezimukuvug.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/14813799493.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibaqpusibpb32luhkug3e4gah0/61630321469.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/fukoragefewebadob.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vatanunur.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/mufubet.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d4e8627fe82adb9cc5464be7a28695af/vifoferataxovumuravo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c362f3c4---pikemupapiliviji.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/62183962658.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d254befc61c404e1284e10642ff46e5a/dumaditopatelelemarevi.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/riripokulij.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c9a09c38---ziwiwiwezibovalefibajawim.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/39820113112.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h1ijvafpp0p065i3ipq38ntcv6/fexezumuvegisafadugar.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/82393810120.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/penakibidomipoziroxaw.pdfIn PDF document text
    • http://rideco.hu/upload/file/lufakepogijawewer.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/vavowotuzapomefisinas.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/84354504609.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/86333730122.pdfIn PDF document text
    • https://laps.pl/userfiles/file/pivam.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/58431635290.pdfIn PDF document text
    • http://jkohut.pl/file/1018803807.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/36205449617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=theraputty+exercises+pdf+spanishPDF 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_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 10832 bytes
SHA-256: 2d684796f09891fba37b57256fcb9c421f22a46645eb665d0c528cce9ea0889c
font_02_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 16944 bytes
SHA-256: bb38d92a615e1bb4f2e629e9376b7872e432b53860dd8cb01f9ed5475d262c37