Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfff952f731d952c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 19:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d6a2b2a94e3edbd2f1bf64dc724ae7a1 SHA-1: 695fef7a4bc57dd9937113b02c34c7a31b4b70d0 SHA-256: cfff952f731d952c67bc817ecddb1d8160d1fba9a7a3bc1e6cac5a4d8fa2e79e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://impressivetravelvietnam.com/upload/files/zeropizotopitozoxe.pdf In PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/jutixaxegujigagi.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/72269630959.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/35609995503.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/wovijisinexiregot.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wotimudizenijovede.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/14391667734.pdfIn PDF document text
    • http://prestopc.it/upload/file/94009413971.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147311c6eb5f---72682711650.pdfIn PDF document text
    • http://firegallery.ru/img/upload/bosofaporubotiwelaxifupem.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/967909ccfc5fa6e7b647190eeb59561e/kupixudivi.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/lemubiboxalebusokag.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/94001923369.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/30428237166.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210926060746.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/repavesarafamolarix.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cb1e0e04---55011992016.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///saduvegoxasobap.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/13261894071.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/bujok.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/77002593595.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3db4398b222e04fec734c2ca75fe7a34/movipu.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/jotunudasuwazepikejin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+save+video+as+gif+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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 10628 bytes
SHA-256: e3d9062828f32d18206897fee51438a470cd2a2ec3a214483c3e4dfc20885c66
font_01_sfnt_off0000c898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC898 16688 bytes
SHA-256: 5f9576447ee256320bad84020bc1d4d904ca439362af789cd5a08ab1352857b3
font_02_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1