Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1568e5782c7406…

MALICIOUS

PDF

103.0 KB Created: 2021-09-08 02:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69483a81d8c2ba607b41887ffa455edf SHA-1: 24cbbdaeb1b3887d7014fb9474d8919afe28903f SHA-256: 7c1568e5782c740615e53041f674a044975dca49ee56b547c8a99b22616acf8c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs that point to compromised WordPress upload directories and other domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=barbu+stefanescu+delavrancea+hagi+tudose+pdf PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed4fdddc9ba---78258815170.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/64518747125.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/29558876893.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/dabaxebitesuxobekimo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f184bef3f2---rozaxiguxuninizek.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/jijubolatakuvewetupokop.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec0c8f401---98507694447.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/26060609919.pdfIn PDF document text
    • https://okvino.it/file/70875947440.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6bc1d4bd39ead12fccc91f8b4910d6d7/58395844435.pdfIn PDF document text
    • http://oodow.cn/upload/file/210611055747201017e6tiilppwcfh.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4019391532---nuwana.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/favimerinozabilosof.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051622343161.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/fotegiromewekoja.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/0e83ab4276810bc699ac486e4284148b/nokek.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/28751969441.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2c4f1234199be783003d09b952c714c7/tinuwupuzubipiton.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/kaxupepakotonaxokuvad.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wurokopumibagove.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/25589729225.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/zubumodulediwasor.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/pulap.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_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14743 18456 bytes
SHA-256: ef92ec334370cdd921101632ed4fe644e45f52d1151d1357c3299b3baa04315e
font_02_sfnt_off000174ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AE 11256 bytes
SHA-256: 15a39bd1b92d3ffaa860fec18efd872b7a61d9ab324980b2b3778acab41d30d3

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