Malicious PDF — malware analysis report

Static analysis result for SHA-256 0574c33dae5e8e35…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 09:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e607cd4f13a35d070841dd9e1bade88 SHA-1: b32687c10c29cfdd757edea8a68c802de2014272 SHA-256: 0574c33dae5e8e359e66b4854111dc9b0d5ed84f8ceb6637ed20fbec7a4c4211
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=resurrection+coloring+pages PDF link annotation
    • http://zaun-produzent.de/userfiles/file/84339090903.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/88723963917.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210706234432.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/5232675184.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/32524228438.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e31627cc5---10126155087.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/57577799376.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0444f8b4---keluvosijabupokivavejono.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/rititazibi.pdfIn PDF document text
    • http://otczenacts.com/media/files/32983467193.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7df49cfb4---74066144727.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/bexodegada.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c06c4aff---sedagezibutara.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/6042837290.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f28ceb6b0da---dadigakotazomame.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9316a50e329ebdbc08b4592a140768e9/wabuxokatatoritowogef.pdfIn PDF document text
    • http://www.heksan.com.pl/file/pesolibulovilera.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/28169063131.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wokadumapisexetuge.pdfIn PDF document text
    • http://aweibel.com/Photo/file/nunamoregavusoru.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b70d93aeb6a---82102099297.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/60923375955.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fhtdfldmr84mvcjbh2ntjfbojq/31885345340.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/jasifopubovogukovi.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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 10696 bytes
SHA-256: 24a23fbc34138ed0260f6574a757b6fa81b85c9cb9737965cffd11ead16a051d
font_01_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16784 bytes
SHA-256: 682df89fd6b6ff0e3b140001cb1f919124a8cc7d8e22eb784166f24321930bda
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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