Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6c3842474029ad…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 15:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6e90010895168c970eed571adac8c89 SHA-1: c6cc5898950b29b46371e8635b268eb2442d8cf5 SHA-256: 1f6c3842474029adcbb5b337a273a6a7642adde3b70b37b52f90ffc3cee58db3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e36e273185---39082769943.pdf In PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/mediwag.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zozoxeremebirojazijazika.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/zojisuxulufolebogomijuje.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/74199832166.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83d899ffa---14686387698.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210708025713.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/94901be18b513219e2335498dd3a4489/zurafoposofuma.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5a884680a---555076259.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/50f733c2b01d9061d25721016389d238/kekuvuzivinavukanoxuxolo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe562798d4---40725736973.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/puvujafidi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/latudufire.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/d37ffurma8v8dnk60vq174omip/55042364011.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/64055902252.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/31cea441ee5c358271e0a3f98a98722c/fejovukekajebiwimebiv.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30d8bb9546---rutotuvig.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/tudomojidesuwekujedenewu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb388214be---xoropijavetanatologasama.pdfIn PDF document text
    • https://ksboutlet.com/file/files/94777993771.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d557f11c1f8---xelam.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/71625843963.pdfIn PDF document text
    • https://medtek.vn/storage/file/mosejonige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=finlandiya+tarihi+pdfPDF 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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 19784 bytes
SHA-256: e696762f1768bc9cb9a20c0bc6e0d264f82191e352fa07c20f6019faa849b5fb
font_01_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 10268 bytes
SHA-256: 7d15c277bbeddd12cdda5bd6d45becffcbf631be103b45763ea77ce39a3a1e5f
font_02_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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