Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f38abd9c7147f75…

MALICIOUS

PDF

89.6 KB Created: 2021-09-13 17:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b32123efd604debb94de75cd24e816f5 SHA-1: d2b9f29da51d235da36b2c3cbac13fb67a6bc135 SHA-256: 4f38abd9c7147f75f71fefb1945225faf5c1abde9ae65d757bd215e6b889eaf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous external URLs suggest a phishing or content-luring attempt. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 http://ideviceplus.be/app/webroot/files/userfiles/files/soduv.pdf In PDF document text
    • http://mamolenasnc.it/userfiles/files/70725793105.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/45108527791.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/49998483704.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/36037767418.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/82992444856.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/14775136783.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/df0e7676e4fa79648e323942b6ea7320/guwigudalebap.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/24492520851.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/25207527336.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_005557_141.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kalugozaja.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/68307910312.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/li058uokjbgklsl3j2ui54k2e6/bezinafufu.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/35356788116.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84966364601.pdfIn PDF document text
    • https://coil.hk/upload/files/17452055492.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zixixuf.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87d1d1879---xizoriwobe.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/48784662160.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/zatejabilu.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/gonirapumurapepifofovi.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/42930278151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cara+cek+hp+samsung+androidPDF 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_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 16696 bytes
SHA-256: f698dae70f3382dda20a7846f077cfa39c1def22a758b72a6637f04589cb3042
font_02_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 11040 bytes
SHA-256: 64c4b0088bc15b810779d9b8319686d0e08abf0dfd2fe174a02e13704e446e6e