Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af82a382ed53f7e…

MALICIOUS

PDF

88.0 KB Created: 2021-08-01 06:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd3f8d1c396ae1bc5247a73dcbd590f5 SHA-1: f2b992a5fbbb6dd2ff8a928d1e03d38c4869f76d SHA-256: 0af82a382ed53f7eedf0c38746e4378ff265e17b360fe4eef29d8f3d0f0af05f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://garglob.ru/uplcv?utm_term=wps+wpa+tester+premium+apk+2020 PDF link annotation
    • http://zezoalza.com/ckupload/files/37503116189.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/jadofubuduzimusekiwaxibeg.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/zerisediteziwajori.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16075c35f3b140---90291849380.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/64436702570.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4385c0ae5---sefenurovetatorumub.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a54130d5e89---14455070463.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/votiwibaberamifebobalita.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xofovuzesatome.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/waxesu.pdfIn PDF document text
    • http://fygl.net/uploads/file/211406069288.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3a6f1fd7---7717721496.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/7cb36b71f978975c687267462a9906ba/rifakude.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/94239929907.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cb315b959cb---27196443724.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210721095807_499981630.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca671534c8---ferematisu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/25702709817.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/48248647928.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0f3ef44e9a5508ddb2da8deb4122665a/rukadaduvofirekikarok.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/sawibafifi.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_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 17992 bytes
SHA-256: 54d310c0764957271e6ef6bbaaa1d5977f95ff8741a28fbffbde6937d06cb567
font_01_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 10656 bytes
SHA-256: 81dde6b830b026c8baf36789c2d5ffa4f3ea6019560c1bb4d049f1869ee7db43
font_02_sfnt_off000138e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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