Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bc889e20d5ace1…

MALICIOUS

PDF

85.4 KB Created: 2021-08-02 21:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca98a65fe24a601eb6672a5532615932 SHA-1: b7d2a641a34e616576d172c76489c07faa8a82a4 SHA-256: 34bc889e20d5ace150065512fbe4d604a12e207bb9bb985c2da948a8962c51df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/uplcv?utm_term=how+to+open+a+locked+ge+washer+door PDF link annotation
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeac27a5d---45580089558.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/53505838960.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/078fb484402e281abdd2138ad613e8da/19674523618.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2f06fb5e---tomudolepodenev.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/78716139604.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/tedibefaki.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210526091402.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/radufexutof.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16262182341733348751.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/pojevomelufemudowane.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/jojavavukitiwozizez.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/12196622250.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6d9814e7---97901302737.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rak4ak224u8p7cn16vm6gue254/nowizukiluj.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/pafijudumomilopi.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/malenetimoker.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/bifujifawisifoto.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/45012215550.pdfIn PDF document text
    • http://chongros.com/userData/board/file/40494246294.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/wifafeturowoz.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/79483236734.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/kunesig.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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 10872 bytes
SHA-256: f32c4a3c654d9228d9ace3257668252d2fc3fe2d82773b274d6bc561ac9c1c56
font_02_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16844 bytes
SHA-256: 83bbe855e893f9282e939f5302fe708349e7b5ea80e0a2a052ddc2f9225febd2

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