Malicious PDF — malware analysis report

Static analysis result for SHA-256 928d5ecd9c48bee0…

MALICIOUS

PDF

90.5 KB Created: 2021-09-21 01:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3950b25d0d7d5a0d7abb5688390f4bc SHA-1: acf00a97cb3bc713889518e628b6e9947881d729 SHA-256: 928d5ecd9c48bee00cedbb1c0023c190e1d05a867f323abbda245b9d6f33d6a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript further supports the execution of malicious code.

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.
  • 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 https://allytemp.ru/uplcv?utm_term=recent+walking+dead+episode PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/478472afe6844cd88eb20c3651a2c4b9/53686320488.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/88261475334.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/wasanexozuwosodexarab.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0485794b39e29cea3d8d866d1e833bee/1028967796.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/zutorepepiminovinasosewam.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/wovawusasozesika.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/mewogezegaj.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6060048971.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/lutiwife.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/51862356379.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/nubupatowakikibe.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wobutujowimateve.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/58934758954.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/totopawujigajoxipuxofelet.pdfIn PDF document text
    • http://kgmda.com/upload/files/tovoporaxofisowuwob.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bd59bf9c0---61655822285.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/65710469268.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/41094611673.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/85967783822.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/wezotipusonubaf.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/suxokidigupizofupoden.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ee6f4656a3ba5bfc24992d29c6559d3c/manakamesegeveb.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/bipiguwevupada.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/nikidabebodajov.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/lesuwufasivulibowelim.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_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 10812 bytes
SHA-256: c2058205a4d3233ee289d95ece6708f5b2d091f8e25743fad26839506f8a40ac
font_01_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 18704 bytes
SHA-256: 8511373100a7331f00bed213d84fa995f3d7ac62b387ded0287cbb6b46a7f00f