Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3e9d3f3edca442…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 22:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5d7034a699803cd3f39c502a6926792 SHA-1: 85cd09ad7e117959b88669aa0fabb35f5cc9a11c SHA-256: 1e3e9d3f3edca44232e8011de19b144b9901743d26b408f19468edf19e55f2e5
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a focus on directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bukharageorgia.com/sites/default/files/file/68106737447.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/joralosedijobadipezos.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f9debdf3d---wasoziriludodifoxapa.pdfIn PDF document text
    • https://cncunse.com/d/files/86731650797.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/dguj3ab76pj21be4bv64o20vi2/sezodategupugavajo.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/30862796311.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e8a876ef9a8339cade0aee9e76de95dd/64068940538.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/wajuk.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/18254929956.pdfIn PDF document text
    • http://heureka-cz.eu/files/fepasivaforefodide.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67313939975.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff544022e---5727619816.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/goluduzel.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607218928f462---50720472808.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff15b1d545---rifogeguzu.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/27536870662.pdfIn PDF document text
    • http://traviet36.com/upload/files/dikil.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/6387311438.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f36d9ff8299c12bf43dd0b35a49ba847/rokaxeraz.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d47e5fd7d0d23a6eb988f0a67a93d1df/wavarogagober.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/juwowazo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5feccb1c---zexafimuwuxojepuzujo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/togubabejoluvubemojazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=business+dictionary+free+download+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/40934949532.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_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 17756 bytes
SHA-256: 2c03878d157bf8e4f666dcf38fc501ba14315bbf34f2366bb874a3d7a44aa9df
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 10964 bytes
SHA-256: ead6932f95a13635169ff67de965415534aca4aee84748343d3b4607c4f44106
font_02_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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