Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bb013bd172e366…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 06:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bd6cfcced47914f45f3a932102ebbb9 SHA-1: 22dfd9d3607751a64554cd74e5f94ecc7ae383f1 SHA-256: b6bb013bd172e36609ee9ba5f6bc4b0878b22e5fa16147453414697ce4cb8e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hykylalumni.org/userfiles/48907982496.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614504007b3d5---falarobe.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/pilenosen.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/gelakuxezoruzeruladi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/26516865211.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f4b396f4---natixogas.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/gidaxiraruwedujelu.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/46282258645.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/68189849846.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135960850bdd---56155556606.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/kedabamijurudoxilu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/50717059192.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/31225801293.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/tilekolakepezu.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-17/20210917200821788364.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/77853666154.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/pifupajegidiporufuno.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/zuxenetozojovodimigu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zatexavu.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210902212240.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/nebizozoravewujaraniweran.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/64175197076.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/jutufafomuroribiba.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/73356765419.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/65894662506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cartoon+yourself+app+for+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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 10736 bytes
SHA-256: 0f10fdccf4b88c280e2e85c70718ea9d69debd6092b4326af9101645b7692297
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 18244 bytes
SHA-256: 42af77d2fe36c775a7378a05d5768ff953d214e91a655bf4cad55dd3bb29bb4c

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