Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b7676f1f014b2f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 15:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31183ed855e936e09f2b40f30ad7cf00 SHA-1: d393ba88552a50ff608aa3a87ddb0acbcaf43146 SHA-256: 89b7676f1f014b2face9b61b2b7cf9ec6392f137f8816832d417ee27a46a1cbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised or disposable domains, many of which are disguised as file uploads. The URLs suggest a lure for downloading software, such as 'minecraft apk free download', indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=minecraft+apk+free+download+latest+version+android PDF link annotation
    • http://eyela.kr/uploadfile/fckeditor/file/18005265070.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nifive.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/fadozevuvitefezobef.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/porererajop.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/vanoxibopiviponiwufowon.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/73749256005.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/27424761.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/sexoverajizilupinaxerola.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/xelejikesobe.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/favuz.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/fezoradufowemiwanaz.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d1e3fddc---zimagopojudofesoboter.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/16996369274.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161436efe5e0b0---fisotarufemojinuvu.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/34674194665.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/6068550758.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/35358155455.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c82732c8b04f6bd4ac03f6ac99abe991/sozobajumipipalusip.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631345598.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/rapofeli.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/92038237650.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/zaxujawibejamoxov.pdfIn PDF document text
    • http://infosierra.es/images/editor/36815286112.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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 17112 bytes
SHA-256: 42e9a321a6671d358701f6b076f2b478bd7a11443d3f934f2c47bbb5c9528726
font_02_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 10848 bytes
SHA-256: e58584ecd1a778bf52360e5c954f92cc96d01f5eb813d51ae636972d3384a204