Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d665fc92dbdf20f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 15:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6be92b0fd9f0a1e0146e37aa4bc28a61 SHA-1: 7250f0cae236834f8b1dabf98848a94fc26105c3 SHA-256: 3d665fc92dbdf20fc7ce75608c0812abe1cc5d880df74319b00c2d775bc282e6
196 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious software by posing as a necessary browser update or extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pistant.ru/uplcv?utm_term=how+to+factory+reset+moto+z PDF link annotation
    • http://dagmare.de/userfiles/file/jowanerefabom.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/turinunonutokixox.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///fifisezop.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/66264020258.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/41963689866.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/zilunivuweresuwilisoken.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/romavofos.pdfIn PDF document text
    • http://maxbrio.kr/files/files/jedipubiwopibokezokogu.pdfIn PDF document text
    • http://snft.ro/media/file/besoxe.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/69946238370.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/tuzejoxenogas.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/tubisotexokemokutesutiw.pdfIn PDF document text
    • https://bliznacite.com/files/zoxexodutenipiz.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/dezaker.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1187eddd---narawizufaxuwusita.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/65015944250.pdfIn PDF document text
    • http://jfe.hk/userfiles/wijakewewuzewuvimikokeno.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/1917285689.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-19/20210919000736926586.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4a39597b---sorafejukarivukafu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/rasibinozotugave.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3755ceb0a76516d0191dd9d4a6c1008b/kuriwebogo.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_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 10504 bytes
SHA-256: be2d209260da47d58d240037f9de4fc2391d4c2c64bce8db6cde22199cac1eaa
font_01_sfnt_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 18020 bytes
SHA-256: d4c27de393e4ac76fb6d1707b5277ae425a600757bb0c6e5e0aa1ad998396d3e
font_02_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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