Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c99f2309d224a25…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 05:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2480a3066774c4c70eca0b41965e0136 SHA-1: 45d801f016f6a9eafa8482e028a490b37c3121cf SHA-256: 1c99f2309d224a2514fac0532db74dae1b5c50ad00eff047cac4e88a7c193a81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns align with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ae59cf2ccf6---fomafigutepotulaxuvegebif.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8479c89a1---fizulurezogokafunu.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/6301741801.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/32917434522.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/62221478650.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/jusamaru.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa043334594---levudo.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/29708421185.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95c9d3f80f---31308607835.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/96177301645.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a60dcc29fe9---tusoruz.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/60382748702.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3625db53---4666454552.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120b59e9db2b---62749019316.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/matosobeg.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/88471730098.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e606c116a0---43919107526.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/kokiwosajimajoje.pdfIn PDF document text
    • https://jotelek.hu/files/file/pukewuxulevolozudu.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/vivasizofaresali.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/35216395185.pdfIn PDF document text
    • http://arsvet.ru/img/upload/13054299882.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/87654291151.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/27016cc50c9bcb8dd0996ea109aade56/54505403937.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/49924029359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+software+for+screen+mirroringPDF 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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 17244 bytes
SHA-256: 4f28aa7d23060af4829a784e0b2b6d3286f69983d212b618b3af689aa9364f1f
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 10772 bytes
SHA-256: 135f2b53cbcbb0a45374fde7219b412a8ee0ea2cd042fca42de722375c4d93c6

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