Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d2a44b2e2e4e50…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 23:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d7e979584140562187f1a0703eff152 SHA-1: 8c10ee834572f791e118c6f6fe05829a4479acac SHA-256: a6d2a44b2e2e4e506044147ae897a83be433e751b161aef35acef5977fed7bae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via the embedded JavaScript and linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=adb+format+sd+card PDF link annotation
    • http://kiiga.ru/userfiles/file/78608015107.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/54846087589.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/64517950041.pdfIn PDF document text
    • http://snsi.jp/image/news_file/34128917411.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/kelifaxirimusavat.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/30899813271.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/622d375a18c76331cb369a5561853caf/redepe.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/79141266619.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad2d40034---bavemidegawupuvonimex.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/nifan.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/33094616479.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/sajusivirutunixibimawa.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/gamaziwo.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/newiw.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/98567002192.pdfIn PDF document text
    • https://salwangurugram.com/files/75237222103.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/57016041259.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109110243469116.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/litiguvisowajeb.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6e7cb3f8---wofudaposefexa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4d6f83377---kimotuwadosuturaxigitaveb.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/sogujigow.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/pipuzurajodugifo.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_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 10384 bytes
SHA-256: 5997c058f24a12644a242f185bc55f6485ace4eb33d3b9e7c0b2e4b1e8dd45e7
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 17416 bytes
SHA-256: e1cc3f83ca0172ea387508441d43e9d48610516715c0f6796debe111c99c09e5
font_02_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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