Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df0991922304bf7…

MALICIOUS

PDF

71.0 KB Created: 2021-09-13 10:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d9a307eb35059896652da703a35498b SHA-1: 506cb76d3cf51513c665c63f89e9e0f58b1e114e SHA-256: 7df0991922304bf7848414ff82413a97b629d857c68043291e9f73e93b720e55
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be luring users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=download+ultimate+spider+man+apk PDF link annotation
    • http://barudan.hk/UploadFile/file/20210906095319370.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/ganonikonurekamonixobuk.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/18524088231.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/gawidaxotofubejasuda.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dadopalatajupazuwaguziro.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/juwifobitulobovitoxax.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/44621162290.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/sutivepadepojixujavem.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/vajuzozolamudogekodazon.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/33614911518.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/womobemixaki.pdfIn PDF document text
    • http://abpaluso.com/upload/file/80465535635.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/gegutelefesimopaxevemawa.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///foruzetakariwepoxe.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5826ad952eedc90417a3dbd050f06211/sefubanubaga.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/vomesanevop.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/hokfnhaav18mqvj6b1do8b624s/96993030305.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/dipevuparusufi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96d0a5b95---39069433807.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae8d7bac0---kazewanowitedanaxeniwesu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/bujesapo.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/parenudapu.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zutogozezebonelabum.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nafutilemutakazetof.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_off0000b37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 10832 bytes
SHA-256: ff3b65ec5520059be70456d71215dcf66d276c5785551bc95fc82a39ea23e6da
font_02_sfnt_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 16528 bytes
SHA-256: 57782dfc3f10da3e4c3040aa5ec67711bf97bcae053409988fdd5fa44d43a45c

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