Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1df49816cfcc0f8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 07:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2161211cd797b0e3cd9bb759565d8728 SHA-1: 72fbbee857e84d21708e9fd24f3944ac3d32c625 SHA-256: f1df49816cfcc0f865f7f11d45427e2f4e50376cde7a557650d87bc8f7d9a6da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to disposable hosting, a common tactic for phishing and malware distribution. Heuristics indicate a high likelihood of malicious intent, with ClamAV detecting it as a 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bibrka-school.org.ua/ckfinder/userfiles/files/90610970694.pdf In PDF document text
    • https://hongmao.tw/uploads/files/202109081620044864.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/digiwebovaf.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/vuzilusewazufakewasora.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/bowene.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/gusopikovidokudidubiz.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/jutejibusudefinenozoguni.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/xifixuxekijaxage.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210903_45BD30DD09FD7012.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe097dff4---dulikalajugexap.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///gekijizexuxorifo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bb948629---32874315727.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/fewigurelabifek.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/wujewexar.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/4227193574.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/43jg45vmfsq5em6go2ihml17g2/96509983536.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138332305688---sazuxuvasekupejadiru.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/vejaforagutovosamorafoja.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/zoforolewamiruzol.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/44236264902.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f725badd3---7640111434.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/62445964735.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7e6b400e2914abb16843756e285c08f2/90269856479.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5d6b00d1---19811702833.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/molanux.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/misanonapejize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=super+mario+64+ds+download+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_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 19212 bytes
SHA-256: 95a8dbde79fed2de998b6bf3a2dac5c2411353f4333d24edb8dfa0a146508b9c
font_02_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 10964 bytes
SHA-256: 7c921df38e4bed7e905f2e6abfa739eb8c3bbb5cc28201b831b935f8c97df29c

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