Malicious PDF — malware analysis report

Static analysis result for SHA-256 9173ae330730be3b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 22:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 777b2a4905494093045f4515fe4a6240 SHA-1: 7db3b3cad0da422a29ec984641bd3d4f2ca4cede SHA-256: 9173ae330730be3be461157d94bbd2fe6e39fb8a026e2bb9bb4cc05776f29d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://budgettranslation.hu/sites/default/files/file/rajeveges.pdf In PDF document text
    • http://skia22.ru/pic/file/vakiwubadag.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/gizejovo.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/faniliw.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/sakovavidulamezudixatefo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1885129f8---45919371777.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/wurasegafuzoma.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/66454970504.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/72670308051.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/dujuxazit.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/bilijipulibimudasu.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/88555325174.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/58548122035.pdfIn PDF document text
    • http://sdds.be/userfiles/file/74370491582.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143928575e0e---41025552987.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/10186423657.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/liviruferolixasib.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff71757ab8---witabupose.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/44629970741.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/xuripaxevaxalomozupemowov.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/dowajanofudoguvojufi.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/zuvubejozaruzel.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416aa6062e3---56045710455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bleach+soul+bankai+apkPDF link annotation
    • 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_off0000b469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 16684 bytes
SHA-256: 1bf67f2f61c8979f7dcceb1953b28f07be0f80c729d6871c223b60f00e006fdf
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10660 bytes
SHA-256: 8478f863c27bb481f57ceb2d0a85d0df0a89af7f9beba299b403c5ec115185ce

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