Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c78dac65f0af584…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 02:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9449f1028d8f877f74db7f505ef4f36 SHA-1: 3175855beea81e0e100dc3fafdc579dc15a1f585 SHA-256: 7c78dac65f0af5847f2113ec2ca49b323efb055ddd007f445a06b1221839ae95
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a potential distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391ba2b77c0---23941301399.pdf In PDF document text
    • http://bbmpva.nl/fckassets/file/85723214926.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/binimedonazulenega.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/guwag.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/migutasalas.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613308a36910c---vugeka.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/5938040954.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/womufev.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/rexolal.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fazutokax.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/26871890744.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60e969f44---mepafufujadalumazokukito.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/gimibutoles.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/24761516114.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/muzijenapo.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gipawudivipuzeji.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/97691007026.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/xadowukupuvatedir.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/9233991673.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/tibutu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019de1715a---64341630193.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nujirisukeb.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/91338107987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+screenshot+on+snapchat+without+knowingPDF 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_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 17976 bytes
SHA-256: f0cfa1c057639bb30a5a2f056a8ebc2f0789d2fe9c3232b85a765a41d48ae214
font_01_sfnt_off00011a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 10876 bytes
SHA-256: 4939674b7c18c5fe3c61c5f4adab3cd0c92968ce72c05cc297cef375a0bbd9c1