Malicious PDF — malware analysis report

Static analysis result for SHA-256 38062dd8242332e3…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 22:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13224604edf39c1d070495ede273ba06 SHA-1: 82e90a2c707b0729be34f5f6d25f56782d1f5d35 SHA-256: 38062dd8242332e3bb77c3a5a660f73f9b58abe5b165d7eadc5c4e72ac71c950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=ds3+invasion+guide
    • http://mosvag.ru/img/lib/file/galuv.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986b571403f---bovudivuliwenov.pdf
    • https://alice-immo.com/userfiles/file/muzusiladamujivubuvu.pdf
    • http://lawngo.net/fckfiles/gefijeb.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/fazefotetoz.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160753ee7cddbb---32145067682.pdf
    • http://angelcabrera.com/FCKfiles/file/1025772486.pdf
    • https://agatanorek.com/files/file/48685031106.pdf
    • http://albino-pitti.com/pub_img/file/wevanixuvek.pdf
    • https://fonixkoncert.hu/upload/file/27187809431.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160baf894b43c6---38772098611.pdf
    • https://kopari.hu/files/file/vifosurogisilibupakirux.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762edc65f75---50118129734.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a557ea14c8---panebaxuxafaduxubam.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/98232804ae98b2956ae559f1f2911fbc/12695639854.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160775de744691---lotunafaxu.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/994c4c01972ca67500cb436e08ae9f9c/14771055552.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/derimosaza.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16792 bytes
font_01_sfnt_off000101cc.bin
fe31632951f398747d9cfcfdc0c6e4a20288482fe56f2f092cdce1e7d97ef1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 17008 bytes
font_02_sfnt_off00012e4a.bin
de5cbe484df1dd771700caa74f34453abf1ef0d071245412c3bda99cf1e236e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 10520 bytes

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