Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd924b53ca64f84…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 10:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92f75541dbb4ef4931722713b01637e1 SHA-1: 25120f36eaac630e8a79ab5b4f27bd3849595f1b SHA-256: 0dd924b53ca64f84d26c4b528da7c038d3fbaca573b55912c3937e5bdcfc3226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/petuwofimek.pdf In PDF document text
    • https://cicadit.ro/UserFiles/file/xokefivanobogi.pdfIn PDF document text
    • http://infracsap.hu/files/file/zerawojasalitutememijapi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131024358390---44945409004.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/66989182683.pdfIn PDF document text
    • http://thongthien.vn/upload/files/salabifuwa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d17246293---kinuwezetagudat.pdfIn PDF document text
    • http://csp.hu/editor_up/81886588544.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/53862993152.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/lelapux.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/pufomimomugowine.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/dumosigikaviwifezudogum.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/9794961908.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/13808945483.pdfIn PDF document text
    • http://ud2-140.com/files/64903953616.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/15569213860.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/20548647209.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/156203440.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/nivivoresogijes.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/finonewemudejiga.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/51485407673.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614447625530f---47604075344.pdfIn PDF document text
    • https://fq.ua/images/file/86009603436.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631439918.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/pavam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=incognito+bookmarks+androidPDF 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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 19640 bytes
SHA-256: c219fb9a079781cc94b2b2c9ba943a367ca92d74b3f2f42238ade265ab1c17f0
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 10720 bytes
SHA-256: 25ce1e3199a13da74c02d1c9a929c6aea26310b7753b2a7f285eab427314b292

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