Malicious PDF — malware analysis report

Static analysis result for SHA-256 8995b12ec0cc6973…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 20:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d8a71e9b15f16cd06bffd68c5242025 SHA-1: 1c6eea531431c915ad2bcfa5e1d4c6e6d7a274e4 SHA-256: 8995b12ec0cc69734287ac151b06356c956b3c6547ff62b633b142704b0f0b61
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb081aeeaf---lomopirinixusabifijatoda.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7701de6e4637482b1abd5cc3b7fcdcf/48520839501.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/dejero.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a68a9b42d04a02af9d8fc27f5d575487/lusitofuzigaforexadosi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0b9b7eb9b---94259312353.pdfIn PDF document text
    • http://fournitures-reliure.com/prod_files/wawaginoz.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/mikowimozuligeso.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/zejexevi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ed46c142ea9---wipok.pdfIn PDF document text
    • https://upaspor.com/resimler/files/11919678472.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/14d58s9ck1907tu9640q223s0t/80922269602.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a953ce5b9---tafiwezew.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fe43s14gq9ne88cia7l2jsutj3/fujuziburusanilofobesolaw.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/ralizupimezitaporo.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/vozelibabopifusata.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/fd97df57783c3299ef32c867611d1a8c/96331152939.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/0u400t228jn6qoo5ap3o65nupe/47529845278.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/doxomofutomip.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1abbae0cc2---4426929107.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/95100456452.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3d421pnga5gv28bde8q0skr380/vefulanumovom.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5499505dcd---vilejarasotana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tv+antenna+booster+circuit+diagram+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_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 15220 bytes
SHA-256: 8eb2e71b1876b42d28aea5eb4deac0158e75cd413c590381936de54abd275483
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 11188 bytes
SHA-256: 44dc9e9d7bebeaa825c5c8244282995741e4f9fb713e464461911718e4b5068f

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