Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18b0978a241e769…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 11:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 245f6e5509f9dc8d8b6c096e8e0d4280 SHA-1: 79a58edacb22901b4cb32b4d8db4a4b6eb73c485 SHA-256: e18b0978a241e7691a6eaa70286480ad42b24ecb0b07f5d23dfed628a7bf270e
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the presence of numerous links to PDF files hosted on compromised WordPress sites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1363139c2a4b833607355cc67c9403b6/tarisimajeduj.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/157e8e21c0ed2c17e2a7caa6df37d660/sivijujodobegulaxabubo.pdf
    • https://birudongker.com/contents//files/tavuneten.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b446ca5f194---21238441987.pdf
    • http://travelport.pl/userfiles//file/78927761423.pdf
    • http://scamps.biz/userfiles/file/28417855743.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d260168ced0---sixopozepemotamekobeveror.pdf
    • https://bestcoloringpages.com/userfiles/file/22542863921.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/mae83j1g05uhku2oj726cr7t24/bubunitapapakiv.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/00c197f794b99fcbf57ccb5560233f40/zomebuxumifavivarobekixuv.pdf
    • https://akvaguru.hu/user/file/purofuvorob.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/vomowofagelines.pdf
    • http://tpdw.pl/userfiles/file/suzebivefakafoboforimo.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/gsdnn4knsqvqq0ahk58n9fibh3/74895155652.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c407f72b0a---mupimif.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a5c811f2---laborenolugeteb.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae22b63beb---wujadimigafubiriv.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca95ae601---46926726725.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e07153debb---jigivowolo.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/11749663139.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/1314993660.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lalitejulojomidalizax.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983b062c284---taxinokukemagutibod.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3a7825d217f0803bdfcc5f6df6f1e0df/48554284095.pdf
    • https://*.datastream.com
    • https://*.ilx.net
    • https://*.streetevents.com
    • https://*.thomsonib.com
    • https://*.thomsonone.com
    • https://*.thomsononeim.com
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ie+tab+not+working+in+chrome
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/18f03f455878856d2985416d05e938ef/sezorebaser.pdf
    • https://*.westlaw.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df78.bin
c3b06ec2bb9a3480cb55cad507ba3e0897c4733ecd09db296f06aa5e854f478f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 10732 bytes
font_01_sfnt_off0000f7fa.bin
94a27f76f3da49234edc3465c5a65ac168f4daacec7853d9add4f4f31b25a21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 2312 bytes
font_02_sfnt_off00010221.bin
e729948169ba3692509f1f77e04e53a4adfd513c02e413d9e63054fd5783dbc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 18164 bytes
font_03_sfnt_off0001327e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 16792 bytes

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