Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c51dbe2b4d6d9f0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 19:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1282c92308c1ae0e6bd5b1a59e282a8d SHA-1: 788e6b27d03b1a995eda381df37d982c57b36c21 SHA-256: 5c51dbe2b4d6d9f058ef04a2fdea741f18753d44a75d01ef6193243e221d3efc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress upload directories or disposable hosting. These links are likely intended to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=preschool+coloring+book+pdf PDF link annotation
    • https://ht-cooling-j3t.com/contents//files/dolijo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46e15e0e3---67807142803.pdfIn PDF document text
    • http://laserinnsbruck.com/static/pajadotedem.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/govotasanexoguvajuxibu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/556823d392bdb6ef4598731a0b6ea411/72074349907.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/sulik.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/78411000313.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/785e7e6d45abd342e997ff0631cba329/88637244248.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/beponagepolef.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/rodexugujilafavibawote.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b728b0ce37a---vunadatifulonirezip.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080e434a9e84---volarazase.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wusemimidagewuxumiza.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c61bea0f---semutivoluroregonafum.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/53561436578.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/70916863160.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4cf72d8773ba81aa16ef6d6995238000/bexagibelixumo.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kapinirujugetije.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fekofinapugisazete.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/venabe.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fd8a309ac---82433732645.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4faa29a497---40126068591.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/gelevokoxezojiw.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/97117854778.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_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10872 bytes
SHA-256: bcd5863c1174ebb6da62ccc412b734b88ea406ba4cc6fa5c4bf2324d52b8d4dc
font_02_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 18332 bytes
SHA-256: d625a2df75e6915289b9d8eb36aee257f8e9e01902e72eb23b722ac2c2bee0bf

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