Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c6a890add30c08…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 01:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88c932e33ab79c19e31bec5cf31355b2 SHA-1: 4b5bc135d496586486bbf8d0948814bfec910142 SHA-256: 20c6a890add30c0846f9524773f526a4e6d6a7c5fc86b6d9dad668580905841d
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations, likely to host malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

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 https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/08b5819dbf4aff5ae661a893f322bb7e/15336988360.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c09889673e---juvisemedatilekojagadoge.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7718506c2f5885aa051ba4c9ec634ca4/zonowinikitivelij.pdfIn PDF document text
    • http://haai.org/upload/file/nuzexugiwumerotawoxuj.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b884487e9a0---sisenixabalatomupuva.pdfIn PDF document text
    • http://ucity1967.com/clients/f/f9/f95c10655bf48216a4b8c8e4321ec146/File/bixajesinavapizal.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/fagokukabilanoguzu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v254hnbs4uo2964pniqgaai3p0/32616357211.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/6871818227.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6ea51ef793f32898f47c05b9b066b173/54707348472.pdfIn PDF document text
    • https://o-dance.com/upload/files/33022891275.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/xorugisamazejefopujisukaj.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19a0e6bfef---16405415560.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/47760660104.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210720200438.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4e16b42cb2384025cf6eb406c855fb94/xowalolobefowinabumogudi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/12863635951.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/riwokegamevavur.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/31161114841.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/u5brbvmfck7lkb09b7idc5o5k0/54588702249.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/redimalejik.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/52333705049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+sum+of+the+roots+of+the+equationPDF 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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 17196 bytes
SHA-256: ac6632310971939210ec4af76b8d316ce37f0078325902f5763f201af14d0457
font_02_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 10644 bytes
SHA-256: ab598ba5de8e7d21759ce6e3b752a6b1a3d122ca3a71055254ddf322256672dd

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