Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5764054dad8bc79…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 17:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cfa262e5ce912114fa74ea4421b01966 SHA-1: 31fc1535fddbdc1650d1ff7ac5dc40c6babb0452 SHA-256: a5764054dad8bc790d65e52dc72b3cab88b96251a231269e413c31245ceb3ef2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=modul+praktikum+elektronika+digital+pdf PDF link annotation
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf4f3f534---jibutitorakitobezofikobo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/67a52cc15cc12e933e07d6e885211932/walegigip.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7dtpplr3h03ceh5et9dn1knobn/muwilepobowonejem.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202108170005252869.pdfIn PDF document text
    • https://carlojans.com/cms/file/16554942727.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e737e75f05c713421b3c874d20e3c833/34240213860.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/6026713818.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c160faaba55---vejanepojuwubuwi.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/nuxusuzanetel.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/43203292510.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1f4c26e4f3d25e6cf98211e3bb47997b/mipep.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/rewoto.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/vukenadobojafi.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/zugalowivupepekifiliwena.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062821342070554.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/avurcdvb35lod9886ran7usaoa/47125814538.pdfIn PDF document text
    • http://www.siposferenc.hu/html/xuber.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/6f8dc89b46ce89c8c032321e54f04b47/nojevagebezatenak.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160de46140e058---kogiwubokexazutepagog.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/sogogetukoful.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75b13d232---fuzagotupimozibola.pdfIn PDF document text
    • http://ksboutlet.com/file/files/linif.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078d31fb313e---86276971551.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/24913991891.pdfIn PDF document text
    • https://citronel.com/userfiles/files/65201871854.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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 20080 bytes
SHA-256: 7f315fea1258a624626dbfa88bd47af6c3bafe69602b332c5282812c95191d66
font_01_sfnt_off00011f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A1 10860 bytes
SHA-256: f4c5aa1bc126aac26fa40659d653dd601010400f06d06aafc3a2913be4f3d899

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