Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a4b87f3e192145…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 11:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc5443048305d49b54e32b744a8ac312 SHA-1: 0314f3d0c90d20ce174862ae24ac14a5f1041225 SHA-256: 19a4b87f3e1921451d7b97dc55c811ae138bd0ecf110f7e9aef031fdbb28826d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://garglob.ru/uplcv?utm_term=android+1+dead+trigger+2 PDF link annotation
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6bfdea0455814337774ece05f6d52c42/32632456297.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/37523377846.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/25114504461.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/87617553104.pdfIn PDF document text
    • http://marymo.ru/uploads/files/kumirizusefibokifek.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7718061634.pdfIn PDF document text
    • https://rajaunited.com/contents/files/miserikusojafisaleju.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/77036551035.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210913_110744.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/defifukepiviridarujam.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/74300320339.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/zezosaluvedabezusos.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136320a4b920---55444229985.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/tuvejefovadetenubana.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/21410420250.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/8537211162.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/af7rhcp06o608vbmn3cnvlehb7/55924700068.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/29718889696.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/rokunekiboled.pdfIn PDF document text
    • http://thevalleytrader.com/files/nenazazunemureburod.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kepurugok.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/36151151571.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/62097575363.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 21752 bytes
SHA-256: 38ef9cf2d4bde0ba55348954932f3047305431ee899a5587a57fff90150bcf07
font_01_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 10364 bytes
SHA-256: e9e282010d3f20b97703d4c6b691b03dac59036a919b8cfd8234199cd2f4d546
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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