Malicious PDF — malware analysis report

Static analysis result for SHA-256 b000d5efff928a8b…

MALICIOUS

PDF

186.5 KB Created: 2021-07-26 06:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e956430489b7ef89c124e29cb5171da2 SHA-1: 196b21c71d6fd8c80ec28793d63fb5966321f9cb SHA-256: b000d5efff928a8b9ced758b9328aaeb1d9d486e3146bfea987e1bfa2d3797d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://haohanlegend.com/Uploadfiles/files/66079080748.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/14772ecc3c0521f139648e4df89f2f68/nigeluriwobe.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/70012714586061e36164b69cae662ea5/fukasizeramovonafiv.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a1c27ed8a6d584f495f8cc2aaebdc5f8/xelusazunogejoluvosulode.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/15056659566.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/77008067258.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tutonozegamesoze.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/28939659603.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea0bf18bf---68435450138.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d666bdf1f---sixofer.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c50d8e1a27116df314bd9a696ad77082/xewev.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/tunaxunenejukefevedimowog.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/33862463133.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/82677415338.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af0162d9e0cf6e1f19364c3a117a791/winajiniratineliliz.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/zajevanusugogemumowuloso.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4734b2bc31---39331138823.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bixubevofut.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/92034844309.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9de4ee2fdb---poxulidazifupekaf.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c968605e361cc9787f76cc1a5533bac6/59242970271.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/25342945194.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/117043478760cd4b44a00f1.pdfIn PDF document text
    • https://carlojans.com/cms/file/vitefivuzubuvixowejavodap.pdfIn PDF document text
    • https://chpcentre.com/files/file/kilidatabadukesebutew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+makes+a+good+democratic+leaderPDF 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_off00027a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A58 10796 bytes
SHA-256: 90f6ae29bb7645977d7b9aad71e8c23b8ac4688e468f77d3eabe10a3be582573
font_01_sfnt_off0002930c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2930C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002ab1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AB1E 18580 bytes
SHA-256: b6e2b0106a152449f4125dc04bce0ec7da1ffb807dc6c7372493daf592091c59

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