Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac4dd2b7f0ea311…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 02:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bb0cfac00d4d2cce38d0036c8bf7ee7 SHA-1: 47d076890ac064c82e08b57c69d3f97091988099 SHA-256: 9ac4dd2b7f0ea311e533d16f3c6a9ab025dcaed98d806191f7dc6b815ab40bf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm that directs users to download files, disguised as an Android backup utility. Several heuristics indicate the PDF is designed to host links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=download+android+backup+versi+lama PDF link annotation
    • http://locthanhwindow.com/img_duhoc/files/4898917063.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/86653432020.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///pufume.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/pukikepikosetewopilax.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/woduva.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5134118b0---72686060261.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d54ae3ef7e97567368d238a5e86d2edb/49540638276.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/58719473910.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/81510400404.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/48125807742.pdfIn PDF document text
    • http://falerisztika.hu/tmp/89062847255.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/fewumar.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/romifexivete.pdfIn PDF document text
    • https://shevian.com/images/file/tawunasinukuvuk.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gigejivogevoxefuf.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/piwoxenudadekudixeku.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631208097.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/65319165650.pdfIn PDF document text
    • http://henca.com/files/details/file/rasuk.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210925045241.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109100049573808.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/pumajukexuredanaxosofu.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/dumujiwejupobew.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161378b105adae---97131156395.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/87694736349.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_off0000b328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 11064 bytes
SHA-256: b8ec2da2dd9388e4ab78d510a64d0defb656f2e01374ec1efe6bbccd2d4e6b84
font_02_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 16104 bytes
SHA-256: 796478cd089d420d5dc460eaa597ea00dbc923eed49c1ae87275376cda525c57

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