Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fedc7d7e0be675…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 16:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7824ba5af17a5fc329496fb6d9db1d81 SHA-1: 5893a22b475d7b2ab38de4498caac92e2a28e3bd SHA-256: 01fedc7d7e0be675eff922a4ab3d37dbb5c0d9069cee6d1f65367e3bc714c171
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using disposable or compromised hosting for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing lure or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d1qa1ee9raa459bj063dh1nsrq/nixoladelagidu.pdf In PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/zuneb.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/40756391633.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fibusafapoxofagarulokutu.pdfIn PDF document text
    • https://majubesar.com/contents/files/ranijekodeduduvoj.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/jixolise.pdfIn PDF document text
    • http://pololanna.com/user_img/files/83440642214.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082119f929---febonasajobomozunamufisa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613036285b8ed---veboparewekebewuno.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/xuxol.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492fdd1f86b---39011416175.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/zaxogizawibadurejavexo.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/31672612988.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/42820485098.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/dajowadozosetopovuz.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/risuleso.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/95292509684.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/julugumiwemibula.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210916015214.pdfIn PDF document text
    • https://airshow-bg.com/file/xatavubagafefep.pdfIn PDF document text
    • https://kawanmto.com/contents/files/gudonupuzejirovomodetovu.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/pemijedumowunoredudusazij.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/tuwupom.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/rupexufulog.pdfIn PDF document text
    • http://nineslash.com/user_file/file/32648211571.pdfIn PDF document text
    • https://lapakunited.com/contents/files/15880004164.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/88016686407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=my+play+store+app+is+not+downloadingPDF 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_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 17512 bytes
SHA-256: 70ead379188517545427e71ab05a0f13f2ffcd52c7b416ca68e9a13928470505
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 10760 bytes
SHA-256: a69689e43282f9d77fdc116faae5a19d20cf22b40b773c26c7c21167a53563ef

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