Malicious PDF — malware analysis report

Static analysis result for SHA-256 888b9370d189a3e8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 15:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f2e1be7282c17f27557c070d2501f7f SHA-1: ed0d049fc4e2462654733eeeff24b4a3716ce8a8 SHA-256: 888b9370d189a3e867fc47360174e2ec7563da137a370177ff720df6bf547dee
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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://alakharia.com/public_html/userfiles/file/wibaporuduwa.pdf In PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/negezatulevevigireg.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/39744b5eb3e5b7183c89c80a5e2b9c79/24755010227.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/letopusobaxenimazuwa.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xifumuzarajagiposawuw.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zutiziwitojemido.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f37fbcb18---kokusazeranorananixanur.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18c079491e274d06e456eba201008f4d/nuxorexizorib.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/nagokigi.pdfIn PDF document text
    • https://ikima.fr/uploads/file/bizirazejozew.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402c57331cb---jasuveniviwuwinekego.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/japajuwezoxivan.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/47045512161.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/7666040021.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/jamobilagovekig.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/redelavajuxafenutefu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d2qa75r2v50ok92hom94djb5a4/72548715106.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/31871795945.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/japutewidikevizomin.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/saxapefazunatenuzemewotow.pdfIn PDF document text
    • http://jfe.hk/userfiles/barifumozigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dead+effect+2+multiplayerPDF 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_off0000d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 17416 bytes
SHA-256: af99246509119ebd302ae81d54fbcf0d1cf18368b320560856f8d799a078e30f
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 10724 bytes
SHA-256: d2587490631fa6735530aed529344dbd7fe88427596eb2a47b2aad5d760ac32f
font_02_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1