Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dbb79883c62c91…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 14:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d966013f20c67efd801b04ef6f50161b SHA-1: bc7091f222d03f38bf24b72bb6b441b3b2a562c3 SHA-256: 98dbb79883c62c91ac760f5a2bf7eb6d4ab05134e1354f6ff184eef64c449c11
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=game+open+world+android+2020 PDF link annotation
    • https://cultureresortpokhara.com/assets/userfiles/files/91012616823.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082e2ce790---33494315959.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff6241f1e---93778255809.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/78246900001.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0qtgqa8jgvrhel29gf5l79gpe3/91591847441.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/zavadegefaxepuwogeziv.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419de15beff---42390177012.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/migok.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/49378169972.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f07cafe4878fca40769f755adc457ae1/wanomotidexuvegudono.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/54061572758.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/rosuz.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/parafivoleg.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lolenirukegivad.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/vivutunijasugupex.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/texafepukovodomexumiwize.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/vegeruxonegikijalitusu.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/56512298876.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/lelumariminawibanekaf.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/37941945568.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134d06b49274---50175012489.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/fojixaweruj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614464dde443a---biketafigux.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lodafinepagodetinak.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_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 18308 bytes
SHA-256: a862ba5b7708bb7323fcfebbfca65f9f52edf050cf98604bde4d75c827b25fa6
font_01_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 10656 bytes
SHA-256: 98c212ad177a3c2a437a0eb4875b4601869ca62210a76908fae566694077fd7b
font_02_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1