Malicious PDF — malware analysis report

Static analysis result for SHA-256 040b3e407a5d48f3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-14 01:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b59272326e6316e524ff071bd7e75118 SHA-1: 9385958dd2e79d12596a1e8967915f3e180bd15f SHA-256: 040b3e407a5d48f3fa7f7d594184aaf029d46022d979ac0f4ddf31255576d7a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, pointing to numerous URLs, many hosted on compromised or disposable domains. The PDF structure itself appears to be a lure, likely intended to trick users into clicking malicious links, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=non+veg+jokes+in+roman+english PDF link annotation
    • http://bularz-auto.pl/images/userfiles/file/luxoduwomufuwim.pdfIn PDF document text
    • http://suaups.net/userfiles/file/duvanubabiruvidebik.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/16004964630.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/volivataxenebarigudaka.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/wisirenun.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/zameniveguwobivaj.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/fomoxodesiva.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/11195721436.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/reriledus.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufurum.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613efb965d308---85371850207.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab698f83b---94002673204.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/56876491421.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/73267423529.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/13159693785.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109110154123581.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/fenitufuv.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/12014369150.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903151201.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/lopisimujomasuwo.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/34873739880.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d50d008e---38344319889.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/22385574517.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/donipuxip.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/fafofe.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_off0000be1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1D 17724 bytes
SHA-256: f402b85b572b34692fb4bd83baa410708e84a71df625494f3d107e634d0a05b0
font_01_sfnt_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 10720 bytes
SHA-256: 961b13568cc55839a0831561a8dfc7de666535b22fd693dfc62db21de989e5d4
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.