Malicious PDF — malware analysis report

Static analysis result for SHA-256 d280e7b140fbf035…

MALICIOUS

PDF

82.6 KB Created: 2021-06-21 18:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e15bc0043e5e7755e4f26bd5c1cadef1 SHA-1: 1e88cc7c2ae436afdec491ebf2f80aed2285acc2 SHA-256: d280e7b140fbf035f37b9c59cf5936f4585e65e2cf028ce52fe0cef1949f5a46
156 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://2440027.ru/upload/file/garapadapoxoxonijerutajo.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/mukejelevimusotife.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/77642790175.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/u998uiihhm9lqttl63uneheiba/14684160067.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0729910001620281811.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/82224957278.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/zanadatisoxu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5507e50b04ff3836d293af2104d1d52b/3302993160.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f95f12093---xubejiw.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caf5785334c---95100220504.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/sigizet.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160aea82d9bbda---32069835729.pdfIn PDF document text
    • https://memoservicesrl.it/file/webuvojewex.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f96c9089---vifijunararijediwi.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/86777714842.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/66306687732c977c1fe1486c4a9be219/82215709214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+nightclub+popularity+glitchPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 3436 bytes
SHA-256: 223881d06dc70f1871edc03b93b9cde02666a309ad4816713a820aa7da80955a
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 5416 bytes
SHA-256: f62d107e4aae3c60e245987da8cca10413b851cb6227b14029a16b855c5c0700
font_02_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 2028 bytes
SHA-256: 8a886e4c811b781a6b717ced0b775151b174bc657aab0307b1ce94e3b2523456
font_03_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 12292 bytes
SHA-256: 0eb16deeebd78107ab402c258fc6f5e64d0c17238cab6020fb5c79c3842400e1