Malicious PDF — malware analysis report

Static analysis result for SHA-256 762dfe41ed1e20f7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 04:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e27736b676b02ab425eb527b49021c15 SHA-1: bc17c55612acc8271fc6cb346fea10ed44a626d3 SHA-256: 762dfe41ed1e20f70504c13af83e56bb449642a3213423663fdad91b88a62fa3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several URLs pointing to compromised WordPress sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://chcial.ru/uplcv?utm_term=what+are+obb+files PDF link annotation
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/887eb0abc608c661bc5968c3ef88da6a/gineru.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wusivuzatewu.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/kilinarilabakokugagez.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xonetefimaw.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/mevonafuki.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/10989298036.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/55133248631.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/biluwimaxolavipixeboju.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/59049714205.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/34465682861.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/53268059603.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/1123228688.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/95425754508.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355866c83e8---423518942.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/wijumegix.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/luxijagapeduvimuxe.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/sexijo.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/39956195693.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/mujadujugefutereva.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/favudejakuvigufiwoka.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/48358461377.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/dugonitivitan.pdfIn PDF document text
    • http://zuszdounky.cz/files/kunemazizumunubexazipen.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/vamofosupe.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/fodavopetuniz.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6105489da5127dfe3b48b98ccf2b0940/vawawoko.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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 18196 bytes
SHA-256: 4a3b7d0709fe388238012339a554ceb2eb3b856f567fa087b12394be80d410d6
font_01_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 10340 bytes
SHA-256: 8a607384b40e8d75a246921c76dd49abe14a7110caabab8aeeacf34c118578e6
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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