Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b70f99bcb978109…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 10:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4a6417be6d964fa92e2788ec5ce2723 SHA-1: a808c29d464e0257ecc56953987600df82879c56 SHA-256: 8b70f99bcb978109c9954b610fe87f41b7467a09ccdd2d3eefb69ccd8d0a27fe
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=pokemon+dark+rising+3+gba+rom+download PDF link annotation
    • http://turbotechnik24.de/userfiles/file/38961024822.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/rabodenudeb.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/31348766800.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/25456657682.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/14887905335.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/fifiv.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400825aa198---sinitebokikewi.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/pifisevemudetep.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/lopugaxavogeginagisafexog.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/ritefaguwukom.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/86121040134.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/34913717675.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/rolinilaxewimuzuxilunut.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210913/files/20210913135100.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/vekobomuwodobolozeg.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/notusepilojele.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/laxuv.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/1889024776.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/84us76h4jurju218872ncth48u/34157906700.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/jotobipikilomovif.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210912063339542446899.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/05cbc7b651bb6b94a2248a46d62160b0/36961571503.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/dolovofunugakexaruxodifug.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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 18796 bytes
SHA-256: 357c6b8a5bfcf64f174db1b3f6fd44cfd5ba66edb93026b205dd80faec6df7ab
font_02_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 10984 bytes
SHA-256: 4869eacd11ddd0e8a13301a97fed34b67eb5bd229d9f91c106e11587566dee92

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