Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f71536393c3d25…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 04:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2955e325c1e98db95c33b289a7307f63 SHA-1: 967aa5260332e232dcd3f1a0f5fb8e5588ad2dfe SHA-256: 92f71536393c3d25c935d3720688fb85708372e029c615d34b67db76671654ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple external URIs and link farms indicates a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=download+world+box+premium+apk PDF link annotation
    • http://darec.sk/files/files/24727450666.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/37aed45ce285d9e155e23d7b207fce4d/62874966219.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/28285245897.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/winaporirat.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161418e75d79c4---gozuma.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/linanalusevusowanasebub.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/juxunegokim.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614538920fe83---45134264356.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142adc3c943d---39430782903.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/3808252247.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimeboxudedosawumumogagu.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/74819342902.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161439261c69de---lidulejegusedixutev.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/zosojofabirisudegil.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/tekorexomijaxefam.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/42748874503.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/wizeva.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/zadowelabefe.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/61862411521.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/xokusukapesunuvusuferavot.pdfIn PDF document text
    • http://modern-pro.ru/files/file/gagewurafolalun.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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 10808 bytes
SHA-256: bd9e5bcbf55e0b8520ed54b9cf2792a17b03a4b53645578686a02084d43d6cc2
font_02_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 17952 bytes
SHA-256: dda4e02375eeafafae40a413605fa99903cfbca25f064ca6ad439cb49a0fba8e

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