Malicious PDF — malware analysis report

Static analysis result for SHA-256 b337a48f0b6741d0…

MALICIOUS

PDF

78.6 KB Created: 2021-08-29 09:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74a4ed5fc1fd741bad35d34caec17fc7 SHA-1: 94586e44a0817ebd50584583b773cb1eb30911dc SHA-256: b337a48f0b6741d0cbd4d1f742f8cd0d998d3580776750c7f5653b259fcfc92d
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://interiorconsignments.com/media/file/61896183402.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4265929c6---fufik.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/nozixamoremoxejudoz.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/koxur.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b80be2342---vokoluta.pdfIn PDF document text
    • http://allasclub.com/campannas/file/ponanajugan.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5ceaa1411ce498b1ee49f711c225e7e9/17487634423.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e0c75394662ef00737bb82dca76d6ca8/femof.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/pawovuverebobalax.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/47157398170.pdfIn PDF document text
    • http://goref.ru/files/file/wujemezozeva.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/7sulj0mbp9h8nk7ii0689jo0e4/8489124118.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f01a701b9---62437367080.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607783314a0bb---nejobuvifirozitobijajer.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/kefonigamozuvukexin.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/88894141396.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/tonire.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/lofeboxufujejemevusemo.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/88850886468.pdfIn PDF document text
    • http://bio86.fr/fichiers/ronetudojinajije.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160904cdc3f857---nibalebovoka.pdfIn PDF document text
    • http://yjccnc.com/upload/files/63620191322.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/gaxuxaxirosatokatunuj.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219f0c30ad---96342064819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+you+saved+me+by+r+kellyPDF 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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 10820 bytes
SHA-256: f8b6791d9887d12a6334c81a099c65cf1f458e92785d5f2b9fbd6dcef479c47c
font_01_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 18004 bytes
SHA-256: 4cd588b6830718bc3db9df697e062335336845e173242fdf02bfca5da8ffd417