Malicious PDF — malware analysis report

Static analysis result for SHA-256 084edd951c61552f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 13:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89020dcd6ca007ebc9aca08df585c982 SHA-1: 5d04e316dc3ea9d8f42ee3567609a120239e95da SHA-256: 084edd951c61552f9477dad18984c10385dd42eeb9152322829625226e65a1ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of 'utm_term_redirector=True' further suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smartmedia.ro/app/webroot/files/userfiles/files/34841472133.pdf In PDF document text
    • http://graficaeformazione.it/userfiles/file/98600010197.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eccf8b261---75987467689.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/jenasifovifi.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/55442815554.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/difugudinepulumariwax.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/41069348512.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kemegowolakedikafoti.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0581e0d4c---lafovufivaxumavonumefev.pdfIn PDF document text
    • http://safarang.com/basefile/files/24279860031.pdfIn PDF document text
    • http://scarpatti.com/files/9054619973.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/riserurevolega.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/sozonakadejitovefaj.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5a40f9c1---53822557271.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/22364252083.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/99272825585.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/dabolemagajugoxinifesi.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xuparutamasikabofiko.pdfIn PDF document text
    • https://grnca.org/img/files/files/tebagu.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/bikik.pdfIn PDF document text
    • https://zzhqhi.com/d/files/bivujuzeripenedibo.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/3872473501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=iphone+8+256gb+price+in+bangladeshPDF 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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 17296 bytes
SHA-256: 3e4dcbad4756aa0b63d338849f5461e27be8bf219d02d8233e478bba99b12c8c
font_02_sfnt_off00012746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 11416 bytes
SHA-256: 5edd57d94fe2600f11f910c19d2eab3c530d7b0d289a93e8172a7b2a7f96399d