Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51338b2dd7ae463…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 09:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 34d0f9f287d50c4c87272c7d6aae1659 SHA-1: 563f9b78d3d052ba3de0970bd0efec18adc11385 SHA-256: d51338b2dd7ae463ebb85c76168c3a18c6a30e1c0238d47ea65a8cd307c65e5a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms strongly suggests an attempt to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.mustwalge.ee/data/content/files/52949827453.pdf In PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/57881844874.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/tadaki.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9892438dd6d4eda4fda7875799b7d46e/gamefubelexodele.pdfIn PDF document text
    • http://altinay-law.com/images/file/fasoxu.pdfIn PDF document text
    • http://expresskaliski.info/file/sewova.pdfIn PDF document text
    • http://faradbox.pl/files/file/56658971118.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/dikananisasifedawofekar.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b21a1f709b0428806a8ba598b3d0cde3/90457424982.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovi6uau1aor57v7jg6vggs78te/toragus.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jivirapanikelukix.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87910138830.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0a8958ce7d4ac9926e4d44cae9a75ad6/basolurufemukolezuzog.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403ce31b753---rabowewajaxisumirasafadug.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b59f3d05cc0016ba0531913625522d9a/5572477597.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131cefc69f4e---17635389353.pdfIn PDF document text
    • https://mediaskills.rs/files/jonig.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/sotapizupaxoxigarej.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/894dd9db1268a8891880ba5a25f1dbea/ferovaxewexinuturobosul.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/pixajufarusuti.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/42691080257.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/28972208020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=officesuite+apk+downloadPDF 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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 18592 bytes
SHA-256: 3aa76f1b00609cacadbb77040f9771d2943fc4e106acb03fdc9762775d9eb34a
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 10816 bytes
SHA-256: c59b9ed0cb53132ca9e769f9a09c5410fe52af19c531c15ca7f43621caf6b9cf

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