Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25efb4f43aa2ff0…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 00:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4a32eddbac658eae583a3634effe03f SHA-1: f661b72378e087a84bdd0785835d4d46684efddf SHA-256: b25efb4f43aa2ff06c3e0ce48e9527950eecd2c2dffa23f970c21aa838dce141
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised websites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as software like 'call of duty black ops 3 apk free download'. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=call+of+duty+black+ops+3+apk+free+download PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/205dddf2cc67797924f27395bcb3c767/15573800875.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/fetot.pdfIn PDF document text
    • http://kasand.com/userfiles/zejedaragupapoxoba.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/gapegetesuwum.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142518addce6---pexumuderavevolusi.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/65434605931.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/woxuzenedajimetitebera.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/bilov.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/dumoduzabumad.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/zutura.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3475da799---lulixebobojodafu.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/65208815633.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/dativuxotavowozupi.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/todiv.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/16239971728.pdfIn PDF document text
    • http://licausi.it/userfiles/files/89089671836.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2180acd6---witogupaxi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149495ba05e8---7858906192.pdfIn PDF document text
    • http://africareview.in/userfiles/file/58568866812.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109230153214964.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/94736213054.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/10838206706.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/02096be25d29723ab907123cffbb5090/30691663003.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/xafugo.pdfIn PDF document text
    • http://napiarsaigh.com/images/wopujiwokadevuduku.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/zijawipavavi.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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 16552 bytes
SHA-256: 7a2e60bf4b62e6d0e271b53c51fa9c1079219ed9ef8b357da4495b38851f3a6d
font_01_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 11256 bytes
SHA-256: 5f864e3c0529c7f4cb5580db11fc22951b487d9a151a4f00a253351eb177a0b4

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