Malicious PDF — malware analysis report

Static analysis result for SHA-256 883587105e43643a…

MALICIOUS

PDF

85.6 KB Created: 2021-10-11 17:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f53549374804bd760c8726eac756175c SHA-1: 15a34f77061e21be283e4b9c0c7e7852d6cc1085 SHA-256: 883587105e43643a1f432d0f76b003f5b691229ab22b71a660b52d71aa83bd8e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ardennes.proximeo.com/ckfinder/userfiles/files/xazuverimuguxodakad.pdf In PDF document text
    • https://dynasty888.com/image/files/20210901_142202.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/rexudixidigixafedipo.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/rikefufavamakaxedavebipu.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/72531652999.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/66204429345.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/gewamaratedujaviju.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615245389dfae---7788368884.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d255b43e0---gajalexujatawewag.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/55893190010.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a85cc4ce7d632ddfbdda48d4fd16b476/zumefum.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/14470906583.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1615d8d6360b26---20857962516.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615c0dd4c015b---17971351878.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/nixenim.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/39cbf8307724b6d958e7b40f3ee6661c/73038905989.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae2c94a9cf.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/jezipoduzogapukubigo.pdfIn PDF document text
    • https://ms1oke.com/contents/files/68887214748.pdfIn PDF document text
    • https://porfic.com/fotos/file/18484942866.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/supuripoxidused.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/xulozosunewovepin.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=normal+lv+systolic+functionPDF 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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 19272 bytes
SHA-256: ad074f75692f684407daaf0eec761aac7376d88d8d3f76918fa42083dd3c20a0
font_02_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 10620 bytes
SHA-256: 6c13a7e1d98f3e274ee8d0b94f7ba87b0fa41834186219f7e8c8aeacf7672d5b