Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f174211970c2b2…

MALICIOUS

PDF

92.9 KB Created: 2021-07-30 20:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 12e298b3d99581dc027c1bcc13c199e8 SHA-1: d3bb6d8d0c34756df286f4a397bc13f7cd95558f SHA-256: 18f174211970c2b28598bfc36695c254f80ae9f976dc72a7c75ee9f94760a1ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://medvor.ru/uplcv?utm_term=bijoux+terner+sport+watch+instruction+manual PDF link annotation
    • https://addsfly.com/userfiles/file/69355505122.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/fd04f6a314ab944750c8688423b1f32a/36214331892.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/garugetilat.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd870c9255---92267047513.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16240169621597543001.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/94584784827.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f596885e5c---45556436749.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/78501805640.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/satigosilireza.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ccdab059ad311a74be13512aac2fdaa5/midalajotosiwamofajujuvaz.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/29047392922.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081546768210---xezobejobezomu.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/fedobobarixufu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160767bb744686---65455821806.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6483beb75dd9a8ed0a2ee7e8cc4e1677/loremigamupibafusigok.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/vixep.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/kulat.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f34774ecd6f---98098692811.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/pilodo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0a655b23dd7c5930374500a3bfa0bd16/mimebire.pdfIn PDF document text
    • https://shibbirs.com/media/files/51744558765.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/40875219855.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/lopadisulomado.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 11112 bytes
SHA-256: b5032336e0da26f1759628488e08dcc67ce2d5879511082dc14f3f096993d3a5
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 20208 bytes
SHA-256: 82c500e9075a9e1a6a1677cbee3ee8de4064916930c403ce1e4041b3dd43e80c
font_03_sfnt_off00014d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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