Malicious PDF — malware analysis report

Static analysis result for SHA-256 4447afca60927546…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 15:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee340ba2da9b878b538ad523228db72b SHA-1: b52c0ec5063f3d167f6d0a478d9cdfafbb715005 SHA-256: 4447afca6092754618f33000c0eb0e71d087fa13e1ac16035dd5573e0e15719c
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 identifying it as a phishing trojan. The document contains numerous external URIs and is structured as a link farm, likely intended to direct users to malicious websites for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=fortnite+2+free+skins PDF link annotation
    • https://equantumconsulting.com/files/files/48413124363.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/sogigegotovovitux.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/vesumuxinukobaburobagav.pdfIn PDF document text
    • http://mestan.by/images/file/lewosalidepezigofixebak.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a980e130e6675e641650083647f2d595/setiwojofi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/moverikuzajugejibajife.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-14/20210914071036367229.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161329a370c16f---13229846584.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772966e4fd---funetodenova.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/rebonaririrur.pdfIn PDF document text
    • http://jucal.es/images/file/93830522901.pdfIn PDF document text
    • https://bak.vn/upload/files/pasodikonamika.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/15604368659.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/44034550706.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/55340270939.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/99745729993.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/19854917364.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/sujigojemekefito.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/75952546479.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/8916606435.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c516c94661---75793514359.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/29802350163.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/lifobimax.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/4739261318.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c35ef1003---31150183303.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_off0000b6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 15000 bytes
SHA-256: be5a2de32d370f8e549cae9ba54080b2485ded4bb0c78b671b676ff29dc4271a
font_02_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10188 bytes
SHA-256: 3db902bfdae08b8c582329191f955287815268257f0c9b0f0b316633eb3c5714

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