Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd450aa8c77b8835…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 06:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6584d39de78678ce0e5c467531e0c9d SHA-1: b12c56318567534b2e286b74c02b90567cb6d582 SHA-256: bd450aa8c77b88354a7061337d92bdad27d8bc11d382ca075d1112f886fb78e2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with many URLs pointing to PDF files. One heuristic also suggests a callback lure, consistent with phishing or tech-support scams. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://avsa.org/sites/default/files/images/files/21342135401.pdf In PDF document text
    • http://e-cluny.cz/UserFiles/file/49430541649.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec108b92b---66880280072.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6c652fcb22ed5f2ebd911bf297c231a1/7668486523.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/53018310959.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/11766478986.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc5d66e87---6513084936.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051811124838.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/26448718202.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/33496863088.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c3865b2641821f7f0c63008171c9fc81/wetexomuda.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a418de36693---fonivik.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1c25eeefc32b3e378dbb8226324337a1/42429580678.pdfIn PDF document text
    • http://hangquangauto.com/files/79043583559.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/pevebenozolebasefoxal.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ft1uh99ptuftq2g3c15hij3lq5/gutifamelulisidulewub.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c0ab84ccb3298e698711dc34533babf9/62859335886.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/30520239752.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a4652ec4332d4a7fdf9f83e7ffe8b882/dajem.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/90221923013.pdfIn PDF document text
    • https://totounited.com/contents//files/lakakumubu.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/28228191137.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522130810696653.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/gupijazap.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b619480a4aa20d81dd08b71ccd49a846/55696625867.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d0180989---7313545414.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc9eaa7d2---jeragexugejapixax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reset+adt+pulse+gatewayPDF 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_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 10664 bytes
SHA-256: 669845e96210386013bef5dc7961800684e534f932205beb8092156454fb2040
font_02_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16976 bytes
SHA-256: 0dbf2f609aaf86595df9e595ddac6614a496f3214d43a387ebda6d619143d8f1

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