Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a0a582c54507b1…

MALICIOUS

PDF

79.5 KB Created: 2021-09-24 02:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b6bb2b9d233b8ca1efaa5cc08a52d7c SHA-1: 2d13a6e8ca4a087be4f49812b473687efe190cee SHA-256: c7a0a582c54507b102e276b4ea4fabb6c21ff776223d94ff61f432421dbcc286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and link farm heuristics indicate the document is designed to redirect users to external, potentially compromised websites. The presence of external URIs and link farms suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=sarvnayak+series+comics+download+pdf PDF link annotation
    • https://cfacgroup.com/uploads/FCK_files/file/13030403327.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/21348052518.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/77375339659.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d55df98eb2---1254269673.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfad3f410a---81016445236.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/61263300760.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/misogojamanaverox.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/datomomunonejamilokosu.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/gunonimokudonubep.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/83271436772.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/ganifixabevefe.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/kewefasifevesugo.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/96633813838.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9c160b1d19aea36c61c89e3b93472fd3/pedevaxa.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_165932.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/45489003339.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/83476082053.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/dopirexa.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/bezujedoluraz.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/togigawe.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/4185675990.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/78759674386.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/85155783413.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/15f02a2592e3cdcfadba601c54fad582/naxixunumeji.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/48765522083.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/3124231183.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_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 20736 bytes
SHA-256: 890c2033c4541acabc1d0ec3d2be30ce41b1f3cbbf0b43becdf078a088a2f641
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 11116 bytes
SHA-256: fedfb92af663637bfe7a123d546047c567888d54a7384c5b4605fc0f1cb122df
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1