Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f057ebae43ecd2…

MALICIOUS

PDF

130.7 KB Created: 2021-07-22 19:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6979037f364c5e02fbeb06f72e1393ff SHA-1: 46f147402fd3d4e7d73789dbb612119c768605e6 SHA-256: 38f057ebae43ecd2fdf630db7d8c2ea6b35ac3c724918671fc12d84433920a16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutuxu.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ea01991c---dikupojorizofibawason.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3f41123b3a682e6913ef5566548ac560/79569913899.pdfIn PDF document text
    • http://fedime.org/imagenes/wolevalivetazakiraz.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/bed053e6d1e1296d3708486b8d92ac73/99496247103.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084be4035390---dafabamolaponanuxejabab.pdfIn PDF document text
    • http://greenbrier101.com/userimages/18767910234.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/fa4f489c370627170a8eb5dea965a9a8/79672295933.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340823e5d4---58191556045.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/kenebutugedapawonime.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a89fb18db4888231389a54453299b6bd/36516323148.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7be22435d---96064224691.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210605_133316.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9ff17129de3fd6176ef8befb4aef6e77/xuramazowelawa.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/70508182914.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/599fc2037d975bed48f738dae7bf637b/sujopesobuwafaxoke.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/tosuwisazomun.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/58911214925.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb271e8ce4---58111632646.pdfIn PDF document text
    • http://axwelindia.com/uploads/duroxiwojetuw.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89d058ec0c---mapabugizofujomube.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/29b1aa588ad801ce7848d7ade5eeec84.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=differential+diagnosis+of+polycythemia+veraPDF 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_off0001993f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1993F 19356 bytes
SHA-256: 1577bdcfa88b37f298de3c8f5bd400e43993bd9129c2307916d4ee49752aca00
font_01_sfnt_off0001caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAAB 11248 bytes
SHA-256: 486666e2322cc375d8bbf97c548bbb74f71103937fbc61c795bf82ceab7e5d8d
font_02_sfnt_off0001e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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