Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ebcbc1755ad47e…

MALICIOUS

PDF

82.8 KB Created: 2021-10-18 09:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f12145fd98838bbb7b26c54424df87ee SHA-1: c6121e043af8a44e8e30810441470bff468c7bba SHA-256: d6ebcbc1755ad47e647fe94c859f8d51b337c23be41857ec58484fd0c2c8fdcf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=before+we+were+wicked PDF link annotation
    • http://biblioteka-belzec.pl/upload/files/dexutotuzuvipoxaje.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/54314533210.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/wonubege.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///35890179831.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/13617698460.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/gelitafewusizebowapefela.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/1109649573.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/88456614522.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/30s7ckkud75h9vp2s3jkkqhf5s/258638748.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/12742527067.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133400a54dce---fuzafuliz.pdfIn PDF document text
    • http://cissi.it/userfiles/files/74042758072.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/wudajeteturigitupudebem.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/13951998114.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/gufifadofin.pdfIn PDF document text
    • http://halanmilk.com/upload/files/bekizifikasukibesugozak.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cefee67845---8288273821.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41866649489.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16147f6dd00ca3---57172182078.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/vekepinubebonufeniri.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/28480998661.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/zidifurasujofojesasasigol.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/rogidevedikexida.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/63597705483.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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 10124 bytes
SHA-256: a4bef7f7972d63444fa7e8c20a1f17f11097594f3ddc242b79fc094335ab5e8e
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 18296 bytes
SHA-256: e9214d17b8e49cb662079bce8bc4c4fa50c84505f6257cded8aa74fc0fcef5ca

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