Malicious PDF — malware analysis report

Static analysis result for SHA-256 df00badc5c2e0f0d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 23:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7cd11a6780e422d2ea1bb69f11aa3c2b SHA-1: c439fb24ef7b8b377c6be18f8e50aaf74312f0f3 SHA-256: df00badc5c2e0f0d35c5e91a22a605d99fa72ccde63bd66c477659342df59e1e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=dina+thanthi+news+paper+pdf+download PDF link annotation
    • http://insureatkk.com/ckfinder/userfiles/files/nitupuze.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/wikajuxo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce9d448d5---57465865932.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/gazuzijafetod.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a4a804a1---mukibumoduxipoxevenifalu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f457383edef---vobujejanedorapimuwe.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210702180136-76900654457.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/82912465749.pdfIn PDF document text
    • http://apcmagon.com/userfiles/59277763013.pdfIn PDF document text
    • http://meta-min.com/files/gerezewe.pdfIn PDF document text
    • https://majubesar.info/contents//files/65002847516.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/22284619915.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/bebovegezivamoxuzipirek.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/70962541822.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b9bf11bf---67977811904.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/dotupunajozabo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/58bb2767fb50d04e31c8d9f9199a8134/32640188533.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1gvo7uvgnhkctd132ted920j2m/pevixugopudumadiporu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c98ac816---fulajupowodi.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/jopopew.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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 18436 bytes
SHA-256: e505ff6905ed744222397746f8ac80a2b0836191ea158f7220e26b0ba30f4315
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 10680 bytes
SHA-256: 655a6a35516a516e1dd08c1f3d91478a59a3175569b02fa5a2216e5d8353b91d

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