Malicious PDF — malware analysis report

Static analysis result for SHA-256 134760ca813dfb9e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 05:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1792ae4131fe4f9126e90c3351c1190b SHA-1: e2f2fc5e7da6c23f9c4bcbe146451ebf944af2a2 SHA-256: 134760ca813dfb9e90c47003e4124bc42ef58e171cc298dc7d5c559e20c21020
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful 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://bretagne.annuaire-regional.com/ckfinder/userfiles/files/taworefefidoganugexijagib.pdf In PDF document text
    • http://placidlakes.com/larpm/uploads/file/14052181706.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc4d69e56---zagalesiw.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/47970337916.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/silazuladiwidura.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vejedopo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130d4e6f234b---nebewasenej.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/segotu.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/wefusimujimutixukop.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/85253749539.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/vigobutijiligidegatojobe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f1401d6c---57415545454.pdfIn PDF document text
    • http://ww150004.linebot.net/upfile/files/20210902175546.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/95852730076.pdfIn PDF document text
    • https://yodobashi-church.com/92521773107.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/57730089697.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/pazebowotikuzulivikodotan.pdfIn PDF document text
    • http://www.heksan.com.pl/file/21502578725.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/nutelewavibepetexa.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/91974073169.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/romuzibajopiresiragi.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/majirek.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tidofadigikoxixerarav.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb8820c7c---niseleme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+nice+word+that+starts+with+uPDF 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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 18148 bytes
SHA-256: 6d5d7ce622987b1a3a466b5866366ca1e43926635c959382a465ae481bf63435
font_01_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 10588 bytes
SHA-256: f104888d709d1eb847f60682abc259d25521ad4f8ca4fd44901f35db98c2ba2d
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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