Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b27e8ad7320f04…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 23:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 47e6ac98751d2bbd60653321676bbd30 SHA-1: 88ecbafb995aaa02367a6958b8c45321708cc921 SHA-256: 41b27e8ad7320f04b29b0fb8060716a3d4eedb41e47734ffa815d99bbe911a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, directing users to various URLs hosted on compromised WordPress uploads and disposable domains. The primary goal appears to be luring users to malicious sites for potential credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=how+long+does+chicken+breast+last+in+the+freezer PDF link annotation
    • https://infotechb2blite.com/bot/ckfinder/uf/files/83588830603.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec5e92f61---10113661228.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/64021147634.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/24980969061.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/65789295282.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-16/20210916022721204308.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/folazawesus.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/kojijutufasixepoxan.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/69715863394.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/99102747836.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/7077251610.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/14a886e93fa2c018470f8d95d56bb853/14323721608.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/14414330395.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/23443714735.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/dopibaxufuvukogu.pdfIn PDF document text
    • http://htwy.com/upload/file/57666011643.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/19303318936.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/48218032190.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409e8fbe59f---58430056287.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/61408312885.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/nelirofap.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/xomefifurusoritinatu.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/fosabilegujerobixulut.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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 11124 bytes
SHA-256: 37ab7031e5132c9dabce05842dbe74f3ba3101638e4ad9bdd0b930a08e8d4ef5
font_01_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 16572 bytes
SHA-256: 11e2c014b38eb960ed429ea7813a1a90bb0214e0f0bf57fd07fad7ac72925009