Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3ea5008da65c54…

MALICIOUS

PDF

90.0 KB Created: 2021-09-19 13:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00d474ac388effc1a982f4571938e8aa SHA-1: 6e6d4eb6a37d90f82e4ce9bb05465ce4d882e1be SHA-256: 2c3ea5008da65c54163eab649ab01b60ff6ef1a949d70f481a1e56d91095de47
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings are sufficient to infer malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://foxhill101.com/userimages/kufeke.pdf In PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/begirudiwowagira.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/fufazegufuzekabema.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/sixijajudibal.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/jiporaxon.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/4092157217.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/wapapepa.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210909180226.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/81706254421.pdfIn PDF document text
    • https://agrando.cz/files/file/mivaxuseledagapojoxaxe.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/76169551087.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6415607ffd3ca806bebaad59bd5e6373/67828315309.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/41449841154.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/sofupe.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/50124015214.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417a3c26652---jaxerojivozosareporawupew.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161325152512aa---zavedasirowoteke.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/8822787598.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/71149192679.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/23327956213.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/regewufugelebi.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/57960912509.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/41284602960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mr+nobody+movie+watch+online+freePDF 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_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 18304 bytes
SHA-256: a292aadc8350c1930fb217034dea010a1f4871e51d73186354c671baf55be62e
font_02_sfnt_off00014128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14128 10972 bytes
SHA-256: 29a8c7c1aa6bbe3a4a1a1662cdb351a5d20d9700791f0e06ada9b6d972e11b8f