Malicious PDF — malware analysis report

Static analysis result for SHA-256 57505531ab277083…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 18:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58aa641ff131b12a315a07e4cda45ea4 SHA-1: cde00ea46cf40067e5d51eb2c71af3848f7afdb3 SHA-256: 57505531ab277083f95addf91df929f937e72472985f505f4c24a32b5654e640
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript actions and numerous embedded URLs, many of which are part of link farms on disposable hosting or compromised CMS uploads. These elements strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution, under the guise of offering free music downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=download+free+music+online+mp3 PDF link annotation
    • http://lucchetta.net/userfiles/files/mujuza.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/9675189090620aeb2c6b90108b7c2d9d.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/72989037428.pdfIn PDF document text
    • http://desirepara.fun4two.pl/uploads/assets/file/82426969766.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/12707629418.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d38a8bfc---73891714688.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/pazukusuguz.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/nukulaxadevumiwuput.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed4cbc0d1---90929609632.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/51555015523.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/1849904668.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/46907758093.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/vuvirovuzasebiwumuxop.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/wosekoverisinaxijarilap.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210909_191550.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/28145679090.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/16215338515.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/58633844284.pdfIn PDF document text
    • https://matrixx.lu/images/nepabu.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/82200176834.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/xawofuginoxakaxokamif.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330f7eb11d5---fezibitepatowuv.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210912_4E36F88FB8F8D6DB.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/xadipewomiwososejawawow.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145625451a40---zaxafuxagawofezimebawawis.pdfIn PDF document text
    • 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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 11040 bytes
SHA-256: e6a85f27be18bfb2b7c28de71397a53790f4ba906f37d4867e5f5203336ee632
font_01_sfnt_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 16624 bytes
SHA-256: 8b7859d2ff463debde90b1e9d3f471847c7bff3997accec7e962b765b7e08c77

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