Malicious PDF — malware analysis report

Static analysis result for SHA-256 f128a421c28fc526…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 18:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbe6893c76fb3b2f94961dd800ec994b SHA-1: 9e8c817bd1f11dd7e9b8a03fdc8c375da4806f73 SHA-256: f128a421c28fc526ddd10baf0432cac4b091300a55492758e71e581f6db76162
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search engine results, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links lead to malicious content hosted on compromised infrastructure. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall phishing and malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://drafthe.ru/uplcv?utm_term=pro+evolution+soccer+5+apk PDF link annotation
    • https://n-zvuk.ru/upload/file/69634454136.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/muvabevabix.pdfIn PDF document text
    • https://hinaweb.com/upload/file/zaxulikamarevexem.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/mepimipixa.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/54186303124.pdfIn PDF document text
    • https://gdaniec.com/upload/files/diromekekugitatipimudo.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/podajuperamusuvel.pdfIn PDF document text
    • https://csodamalom.hu/files/files/52402028972.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/32589212045.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/mizixosu.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/1193752792.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/50438210687.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a47da87a---xakadenugu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6aa35cbd7d3dad89a1b5838dc8b94244/7642897752.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i5d0ufc0o4tfqpqcotg6dkpsko/80001416615.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/15330783986138a1ffbaab3.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/50150863419.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/48314090895.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/59034641680.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/99689451398.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/15155244263.pdfIn PDF document text
    • http://megalaserasia.com/upload///xabejov.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/wofikobexu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 10760 bytes
SHA-256: 696d8104ba78891c3243fce4166864ad8a01beb16e344a5d0f0d3081c8834914
font_02_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 19064 bytes
SHA-256: 560faaf354a75cc17753879b0e9b0f422c8114143aa9396e37abd8bbf5219403
font_03_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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