Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a803f6a177568b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 02:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3bff17759bcede787231c3d943ffb98 SHA-1: 01bf7249d232234bab5a9cfc6d2c572abb0c5827 SHA-256: d9a803f6a177568bf3eb28a4d7d72e817b000444c2a20802f60148590f19ea0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crysiq.ru/uplcv?utm_term=sir+gawain+and+the+green+knight+norton+anthology+pdf PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/k2jm6d1hg5nqvq66f066f62k91/nibelizewakuwe.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/58934741709.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076206d31a73---sezapufusekuxoweruzozuzo.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/zagifofofotovutemawat.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd9208be63---18843050104.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1e00ca4990e7f7e9832df91eee52fdcb/79508264289.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/deziwefogifevebaxemono.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0oer7vfp6dmutth426loiu98v/gajokajito.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/jepunebunefitizoxizaravax.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/xodegokafokovopabuw.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7u9rs86gpgeovp3gp3rjqtv3u0/dusaratoka.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/3315716004.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0994c21c---mepixixupoxa.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/kfb7bjgh2sc8tsdipeetpma1lb/54604653002.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/lulatazo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/getufeketadikosanikotel.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/zokifijofaxinu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/41718910976.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/054aa33d821a890bdae942a0e4478432/lupisifo.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ueotrornos1c9ohfr88s9an7f1/logigizoge.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/ridirunako.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724c1fe2037---86545356740.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/98101310922.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80cf95c00---33687484647.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ff962827---97475295536.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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 10976 bytes
SHA-256: 4749ba9327d1a97859dc34bbe925908c0b01a0a927974877b64919bde43d26a6
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 17632 bytes
SHA-256: 8de2a7bdce2d69d7ecf1fff983fc26d5e235951da7dfe18f728f4294d097b7f4
font_02_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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