Malicious PDF — malware analysis report

Static analysis result for SHA-256 2929d7ec9c16162b…

MALICIOUS

PDF

67.3 KB Created: 2021-09-27 16:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 254508fec031f14b40de11106b371449 SHA-1: ca1c571668a246e432508c190c1ae7c5fb0a1a84 SHA-256: 2929d7ec9c16162b373736e969fd495b765723ad264ace047ad238b7fe2c6476
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. Heuristics indicate these links are likely part of an SEO manipulation or phishing scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dondepodemosir.com/userfiles/file/zipup.pdf In PDF document text
    • https://tierlistei.ch/downloads/tenuxixiranipozodizusena.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/rujulakeruva.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bbc525f7---liduz.pdfIn PDF document text
    • https://losungversorger.com/product/file/lefegalidowiwotur.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/gawajimudopubalolas.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/51763195378.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/47303078373.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/rinotuwixitutokobutobe.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/5949381692.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/65244703601.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/55660498148.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/23061022516.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/diwuboberupikivudaweko.pdfIn PDF document text
    • https://vendax.ro/files/file/surewu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360a74b5167---latob.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/bezofoxodugazevofebu.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/wanoz.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/56827457521.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161412b85f31af---44677929315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=solar+walk+2+freePDF 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_off0000aa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 10120 bytes
SHA-256: 47c4a5f41187024ac2311e34f29bdec9d79972c6e2899b5748bd67062aa34d26
font_02_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 15380 bytes
SHA-256: f6426928ce1eaef2afec5e0e94047d274ad673615046fd017de219112b4f7b46