Malicious PDF — malware analysis report

Static analysis result for SHA-256 06cdb401f11ac03a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 01:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bf6a2e77d5164c562c70cf92e98693b SHA-1: 0177d89a9748a609852a833e736ff3b43c8fa360 SHA-256: 06cdb401f11ac03ad9328231daac2ccd7f2b8b917fc48e87caacdd3e059fcad8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests these links are intended to lure users into clicking, potentially leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=bsc+1st+year+pcm+books+name PDF link annotation
    • https://abe-rdc.com/userfiles/file/noxupikokuk.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608194205ca97---zusinupixofidofolorobi.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/85143701791.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/78083336433.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/09mtcpn3flodtljfkc5tljkn02/vagekimibalid.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/450926cfc91e7b8cfe96766ab97c83d5/libik.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/36167148623.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gr2k9k5usqvrtnd5eamgjg3fe6/dupuxodasakupadikoti.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/68284235325.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7ec15c0a---sakesedir.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/63758012801.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/bawasixukejabeneteru.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2roo1s2dn6hbeonmt0on9prfjm/bebulesixumalugafutomu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac876217aa---nugujokabexolarazugedas.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/pexegovedukapofudam.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/duzoj.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/47545462917.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/57885752546.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2cf49fae46d2b701a8d5dc9b2fc09ad4/sevazuxoludetomawamolijop.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1627080120647300553.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/53806426629.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093e2e9ca977---12232411140.pdfIn PDF document text
    • http://erpos.sk/data/files/98644412001.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/19631611352.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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 10848 bytes
SHA-256: b0d76f3a1830c51cf6410b2b6a0aa7ca5705c9142cc1348dab95c07919b27a0a
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 17844 bytes
SHA-256: 48e8a85cb58acd527ad8fce0838f6148f570e4da4a089bbe1e7347630163b91f
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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