Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28144f20e2142a5…

MALICIOUS

PDF

108.8 KB Created: 2021-07-04 13:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fcf74b5a559abe4fd6e992a5267cac3f SHA-1: d0a162bd4dc2e0afb2b120462d4304da75f892cc SHA-256: a28144f20e2142a53e3d2d41903597f18052da7dd7d7da9e81da0104837873f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aylincinarli.com/fckfiles/file/10629419563.pdf In PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210616051309169986fvja6m.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e159e24e---magupadijizubido.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/75361355320.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3daa4ded669943d6cddb50d035accb87/42965604717.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/6702531372.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/welutu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8821cc62c---gopiridepiboxoxijab.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/21f68c4c193a62ba325dabdd3fc30387/vigogatujigepezeda.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6ff0dd17---6601966515.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tq5i528d9ma1bd82gm43tpl811/vajezinafavomid.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/15538142985.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/tefufejepelube.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/visizelalumopomoxori.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092857e183e3---kenugekarivibozipi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/h8vs0fethv5ah6sv15mkf0213d/mefasosepiko.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160811f671e752---pazutusowobusover.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/duporexakiwezutowovoko.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/20367601857.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/30d260cb0e81927254e794f2cfb8444f/nirafozipaxag.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddb2e5e93a---53203156505.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fe9d352c037b27580ba540e85b27642f/53188725739.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eb3f7930d595400a312c33e57e993b79/nulad.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb79c6df2d---45034634004.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/digedosubomasorobaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+draw+raptor+fortnitePDF 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_off0001485e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485E 17616 bytes
SHA-256: fe61e51c56ff877af43a55c45d80ae0668d492530543254f79c73f6e1c35d8cd
font_01_sfnt_off00017659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E70 10356 bytes
SHA-256: 1ffb82edc2c842593f3bc14bf50abd6b8d72085ea48247f3b1b061a2f9f23b6e

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