Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba219417ae4ca13…

MALICIOUS

PDF

95.5 KB Created: 2021-07-01 19:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e77036c2be6838827849827c711e8a46 SHA-1: fd321382fd2f775fd41bf7c63a72353a460cc577 SHA-256: bba219417ae4ca13fa68e15d68315ba91e4fe6ffe2024617054e9e46720255d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://pmms-online.com/assets/file/jidivuj.pdf In PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60bc01b5001d0.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e025f626d6e843dace86baef1c1a54af/90485310451.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/s9q1am7007lqebjt0rhq403t91/tojos.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ff207fcf134495423b0e1692d1a400ae/53649149366.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076038a95a4b---zesujofaberakulekiwelo.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/40250535572.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/23206466835.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766fbdc6833---46910751083.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607081bc0eb99---rumeguboxepiwategexa.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/nimexagunuxi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/kedigulitikasovizakomo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/229f078c2c77be8203b25a4d46645897/fubavaxuzad.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d8a7ee27---mogawizipuw.pdfIn PDF document text
    • http://skncn.com/u/files/65810194519.pdfIn PDF document text
    • https://digireg.pl/upload/kiradane.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/tofudukugilodapex.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc08caabde---36580133504.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c034d295---buvuvibix.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a57cba92391---ribozixebibi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd81c1c961---16953669224.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/51175723184.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/726f1ca91ec82707773d0ccf4870f2e2/32824035451.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/sipewam.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e8e7212b---47548018313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bully+pulpit+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 19796 bytes
SHA-256: 2b773953c76af2561f82896274f72379d670ce0edd4711359a36a458c61011fc
font_01_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 10476 bytes
SHA-256: 06d65a9bf1958a0798040af691a1f66dbc69d765b74ea07e15de414f3b9c23f6
font_02_sfnt_off0001417d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417D 16100 bytes
SHA-256: 7ac375ee3f87dabf5a8aab9ef66de401914e669ce569ae72251ce3f3871ecaaa
font_03_sfnt_off000156cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1