Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e551d72885a87f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 19:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 076270781edbbd83e9b9deffce0ba043 SHA-1: c75d9d744fb27b1faf588a8351dccb24dbf85c1d SHA-256: 28e551d72885a87f5c8321c8de81686d2323d5545eaa0483dd5eb2f6f5c099f0
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 links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=in+osi+model+dialogue+control+and+token+management+are+responsibilities+of PDF link annotation
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/61450714818.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/84216475487.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/megubexifiwarobezuw.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161333304ca2f8---49556631911.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/nakitawigepeko.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161357cbbad275---5530582465.pdfIn PDF document text
    • http://strandedtattoo.net/file/rariwalowinimeki.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210910170342975418.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/30539507375.pdfIn PDF document text
    • https://rjpexport.com/files/ravawodekupug.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/xugomusabora.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/21536530205.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/51328229570.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bozuzebikedet.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/39260355667.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b730dec5---510076378.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad6a815a7cf52ce179378108aa82e34e/kugitojarekirena.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/2292448312.pdfIn PDF document text
    • https://denimder.org/resimler/files/25702740511.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/78945782926.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/33167387910.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/89762467577.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/94806975905.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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 11244 bytes
SHA-256: 820d5ceac4d2758c8dced1301708dda2e57569790cac1ec73b42e711cbbc1104
font_01_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 16680 bytes
SHA-256: cef10df6b514b56f56d0a36729bae567b63a2876d7ae66811aa737a5d68616d0
font_02_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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