Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedcfcd3a18b5f94…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 23:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 845fa4f42535b8c9d1d6080b9a603eac SHA-1: db4b5b017bf7d7084183a494ec30ecd43404c44e SHA-256: aedcfcd3a18b5f9449551dfc31a1257ac4bb875482244b11780ed05ceda769c2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=emulator+is+not+working+in+android+studio PDF link annotation
    • http://ekbdrive.ru/ckfinder/userfiles/files/senuneboxosizorefina.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f61bccd3b9b1aa8dd2038cefaf817d4d/fulizotoralodiru.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/lizuruzurukopuvoxes.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210926_CC530D5A678A11FE.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc98b6010c---92164978178.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/72594938687.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1fcd6d7c6c2ec7e1401e9389e6eeb027/85060247920.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/ferim.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ajb05s0s0l2fs7ope7sipfhb3m/rupemokiv.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/rogisudovekitosot.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/86786447057.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/jabadubowuxiregetewuxoko.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149aa831430c---16112347295.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4e4faa44bd5d771a6713e2e9754be2c8/tigitarirejejifuvijewoxo.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/78016173362.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/26372108631.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/danag.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/85670100584.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b680c1b3---64600116788.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/migekawiz.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/bipukovar.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/64035913633.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/xojidaluwurazukabem.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/85527666583.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/45658374336.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/17870dc9a59a0db02b5d80f234d741ea/pepojenozesin.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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 18744 bytes
SHA-256: 473a4701778002aa959804a84de75b871a2abdc3e834029fa981aa5d24c64451
font_02_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 10720 bytes
SHA-256: 851761b33bcd4b0f5ed5ffd83ce3d631e25d20c33575aeb79d865571aa91dd57

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