Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6f1b3bdafeb425…

MALICIOUS

PDF

96.0 KB Created: 2021-09-21 22:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b084b4aa1e2b4aed47b809fd9fade73d SHA-1: 27890f332517eb717b5f642509b2e9365545b63c SHA-256: cb6f1b3bdafeb425efcc27fe625b1223618b90365d6ce83b8031cd9b4ad95ff7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=import+project+in+android+studio PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1269c572cb9a1e5da22cf1c92d860091/totes.pdfIn PDF document text
    • http://merwepizza.com/upload/file/30366618210.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/35295010407.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/runuxafokowazoxotudo.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/88872370022.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/22590006980.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/gojesupagekasuzevixosodo.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210915_CE27C950DE39B86E.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/5201612452.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nivubuxosemifogamixurix.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/jadefesijajokesasonaveb.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/65841924025.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/75170075495.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sopovatidovaduzevikaved.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141043ad030c---63471893740.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/5529945795.pdfIn PDF document text
    • https://priscar.com/documents/files/vuwipegiranaruweju.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/pegutivegesedob.pdfIn PDF document text
    • https://sapporopools.com/contents/files/87543355370.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7b5bd719---bemixezuwapopoxujenoj.pdfIn PDF document text
    • http://livestocktool.com/d/files/40039931043.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/49489081370.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xubofedaligegatata.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/begukofo.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/lelikosekurujenexofafur.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/5553015395.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/nunemaketejixapufepa.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_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 17508 bytes
SHA-256: 30ebeda979820921fcdccfaaae498a09e816cb720bdabf3c823b82c579879df1
font_02_sfnt_off00015907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15907 10808 bytes
SHA-256: a20caf60d6283883d378e5b1006401a915351881cbd4bca3c8b3a2f0d927a7b4

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