Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ca5aaf3fbf439a…

MALICIOUS

PDF

82.3 KB Created: 2021-10-06 14:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 146577d7e615c65f2e56a02c9d9603b4 SHA-1: 975456028392ced0743dd8df54d5e1579a421237 SHA-256: 58ca5aaf3fbf439ace8af11d79410a5e3ed3800492b9000366eb190e4da0afeb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, some of which are disguised as PDF files. The presence of numerous embedded URLs, many pointing to suspicious domains, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://neodentpetrosino.it/userfiles/files/18235915753.pdf In PDF document text
    • http://infunplastic.com/d/files/77740520340.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/41977998485.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/lubuligipojafusowitok.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/34388238341.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/51902759882.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/najimilifebazusufonop.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614715b88ea84---dukag.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xapaviforokigoluvov.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/buvuvikurijezakijepax.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/rojarewalixufiteva.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba60d7e622---36740688772.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/52919276427.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/8182895479.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/bosenibiwufomamo.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/67205614905.pdfIn PDF document text
    • http://gyliver.ru/files/files/51897266685.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/35015010466.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/vatibumekeg.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/wakekofawemejatus.pdfIn PDF document text
    • https://dptech.vn/uploads/files/24611071611.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bf015c53ca---70902729304.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/56589733126.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/33845805439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=walmart+leave+of+absence+packetPDF 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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 19304 bytes
SHA-256: 2147c89b88a1e95d4534d34da31f410ee738442ef30781ba94ca7efd86087162
font_01_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 10840 bytes
SHA-256: 9dcdcccecf162dab7bbce52e45713ea093b07c6cb0f13925ee05f62bb445f043
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1