Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d19f2cc60a2690…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 11:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 021aacc7559841c1f14fe055373ed64c SHA-1: d71aa519354399dd6c9ff72d853d77f0afb35549 SHA-256: e7d19f2cc60a2690d07a4400afe41b6f29bb3727819e1def1049e03d3ace9973
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. The URLs suggest a lure for downloading an Android game APK, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://nomylo.ru/uplcv?utm_term=god+of+war+android+download+apk PDF link annotation
    • https://asken.as/bilder/file/wusanovinidevofobuku.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0b15d65c4a7fd0f79f262690dd44caf8/81956141351.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0b778801ae8704ad965baa1eedef8814/74545611199.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090409552358.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/dakokekeliboletadefud.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/pebuxilujuwivadaxilaka.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/ditagepevilovowofofus.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/muvoripumisifadamek.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/59601216372.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/fuponid.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/35659682253.pdfIn PDF document text
    • https://wecareprogram.org/images/file/74854529949.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/fevepo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6e82aa3aafde78cc8d3e48a0a9f21e3f/bedegalofadawelinizi.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/63514521255.pdfIn PDF document text
    • http://coumert.com/images/file/59059349313.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/acda32b23de023cf56fd80ed82c6cdfc/mavalalimojafe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05667032d---wokuxixipusizedixinimoze.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e2e124bf060f82bea436fc6fdf45d9f2/12931958027.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/nomutagatigipamifoxa.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/20781575693.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138965defd9b---61633495552.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2107eb6e92a1788a1735259254d313af/61218844214.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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 17032 bytes
SHA-256: e49dbc8f18546b0a9f0420e369caf946c1737395478979d5d271cec097839064
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 10312 bytes
SHA-256: e2ac476a05146aed4c586a7125ac637bae3e62b12701e03cf7a7460a59985bbb