Malicious PDF — malware analysis report

Static analysis result for SHA-256 405cdde159b67f03…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 05:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 425e3b54f96accfe352a8e5ccb4bbe88 SHA-1: 03fe059c3277ec3f4b728af3cb722a6415ef3607 SHA-256: 405cdde159b67f03aeab41e58eaf3ade249a969628f7cacde3e807589ae555fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://angerdress.store/ckfinder/userfiles/files/jowafexuwuxuzeselowijiwo.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/robuvelobuse.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/davipivef.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac5ca37fd6---65665302824.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uagtc03380akumjiuiarr7970d/15786287004.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/e830eitdun7hdlnb24irehe7n2/ladiwovadozifekugebu.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/58603596234.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ebab679e5---loxunugojimaw.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/nirerugawefo.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/14209150105.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/42943742491.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612185123cef8---kogezuvarevukezifakuwixi.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/85516448555.pdfIn PDF document text
    • http://soles2walk.cz/data/file/42807106114.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca05986f65---xuzozu.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/jagewakowezefavasejum.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd70446129---34072867396.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/zewowafiserebeleta.pdfIn PDF document text
    • http://asztromiskolc.hu/ckfinder/userfiles/files/31043154226.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/c4e919597783150bebbce55b4ff92b55/sonivajodozapelukugid.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/ca3b862980c6ff19af297d8d95a8be1b/99340478314.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed0992f24---71300812033.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/72128769158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=java+solid+principles+pdfPDF 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_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 18288 bytes
SHA-256: 3f94a5ababcff8306a26bafd4956e924bb878db093ce5e7da2077baadb495d70
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 10572 bytes
SHA-256: ecc8c5dda1f08fcb39f90dc1a429e5062af8e1a8b78612773bae8449c42f5715
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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