Malicious PDF — malware analysis report

Static analysis result for SHA-256 4215d87ac822eccf…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 03:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3bce6f8bb89ec8ee4c0498222d0a27e SHA-1: a09b9279fcc554235017995252ce843ddba126c6 SHA-256: 4215d87ac822eccf654fa983d6bfd8e868fe4a27a2b1f7968a7dc80e01684dbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, forming a link farm. These links likely redirect to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=trasferire+rubrica+android+su+iphone PDF link annotation
    • http://predit.ru/admin/ckfinder/userfiles/files/75302882307.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/48nac53k22oj1q6528ph3h55te/mirekopitewip.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3211e81fd7e82f1323437f4c79e95605/fawikivareboranumuvul.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ac39e886bf8a8de5026906ef235f5a73/totajavarerugow.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/fuzexirubupotuvevotuxolo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba27bb4d---85587869961.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/969707b0e290b2dba5de546a9adb18fb/fudolizobarikemixajavipa.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/37969228391.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613125454f02e---japuxarokujemorunusedov.pdfIn PDF document text
    • http://teresachild.com/upload/files/51961883292.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/lasusotem.pdfIn PDF document text
    • https://alkoplast.rs/files/fopitolaferon.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb8619615---85596480671.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/sobujefole.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/xejisagegod.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210910_C3A1CA938B8BF16B.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/57634273125.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/dofefal.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tobamobixezifezakated.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/kupoteveridimamelexer.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/gopasilijosoxuf.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2adfe2e19---zoluraladadaxomok.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/54158675486.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/85438515762.pdfIn PDF document text
    • http://effekt-film.de/files/file/birejosafef.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/37608567385.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 17400 bytes
SHA-256: 9007e472df70d1ce4edec366b9964a5f3c3a6f70314ca639f1d996e71b6b1598
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 10776 bytes
SHA-256: c99d7bf9baf1d02b16af0723b128a738240536c3c59319fcbadced23fa6efc4a

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