Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08577e7ab7c2cb1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 03:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d85e21b0e9d761da7844e4243e443e1e SHA-1: f520ce734bb2eda4ecd450440290ff28e4837de0 SHA-256: d08577e7ab7c2cb1c6ee30c93ed20d671d391027a29a50c2a0394a51f33d145b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=wowhead+classic+mage+leveling+guide PDF link annotation
    • https://hurghadalife.net/userfiles/files/88762941678.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210820110351.pdfIn PDF document text
    • http://bakoca.hu/files/file/nizewubibomuluperabipu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d5c0a819ba75450e6712b4c6e3717659/77103315058.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c8a84c8f9---52055831363.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/823vnts19ns20cfbumfju9mo01/xilusopejupiboxe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2r9064r5j37fectf9kif2gg8gr/47305369893.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4d5e91b3e---dasawejegimameraverux.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/86254967010.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/7tfnvgtjcvqo14519jo5j5a3p0/90079907198.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/08/file/tenimonanaval.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/58969623249.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f4b7236a4036c97fa85afe7b02d87a1e/99032521088.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/seejv7o9pdqm1e4mbg74u7qr35/75882940639.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5c62f880---pebofefikumer.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a1c8d3554bb63f312f5cfd923ed322e/loxewijupebusipugisona.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/vorapofopomalisanogugixu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4663b5cc8---gixixakedizas.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/26148994309.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/7454212215.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e2f1072c506ff44f723e921019850f66/34533758064.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8d76ca32---81571082164.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210722_FEF01351F4193E47.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/berewotowivemiga.pdfIn PDF document text
    • http://allycatering.com/userfiles/muwonuwaponolim.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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 18076 bytes
SHA-256: fed626a637f8655aec12501e62386568912320f4317b3844da6cc2a68d8f4889
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 10864 bytes
SHA-256: 09e17136912cdd41bf8651c2c319825ba4d8d3680bb6940e98acedcfeca439f5

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