Malicious PDF — malware analysis report

Static analysis result for SHA-256 d499c64651d06560…

MALICIOUS

PDF

94.1 KB Created: 2021-09-05 07:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 006066fd7be5ec2f37db19389b7a4b7c SHA-1: 34d3965c9c575617214305c93b9e5ae420f2230d SHA-256: d499c64651d065602051a60f1b9dc5906d2dec080c757da251870f3cc8654a9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=heiner+m%C3%BCller+philoctetes+pdf PDF link annotation
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/eb5bm7rvhfqs7nvsk4fc2j4ea9/wituvowu.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zalodakesu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/58650243288.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b309b5d38---xerumerijib.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/24885000296.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/kigusijajukunegu.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/manunimalofewulijur.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/20748405687.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/64288c2c358559f9e3f596eac2c8ac3c/sakudopew.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/54662912963.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xitadojozofuvavezala.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/tufibafupubofo.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/miwubizolasazenivow.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/42802581003.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/vunimalinalezupemowijok.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/39542250588.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/40427493686.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/poguxokuvuwuronag.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vuzuvakuzi.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/xapizepuse.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074dafec2720---bogesafilo.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/neniragatakejalosidobom.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/vesegopukunibe.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/89186118504.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bafalew.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_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 10908 bytes
SHA-256: 4ad4ebb44002d6c3ef951cc96361ed8f0ed502a7e1e699d8eeff31ded5146b03
font_01_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 21036 bytes
SHA-256: e966aa0dfa93f65e111da6ff585a52274096d71682e66e30b1811842e30bf471
font_02_sfnt_off0001509a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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