Malicious PDF — malware analysis report

Static analysis result for SHA-256 40571db9ffecd925…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 20:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e76e70dea7f7b1240569077273f177d8 SHA-1: ad38f2d6cf9a60d49547012ac49222d36039cbbd SHA-256: 40571db9ffecd9251f91ee81d4be2f73b794355628fecfe93af580782274a391
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://archism.ru/uplcv?utm_term=happy+mall+story+sim+game+mod+apk PDF link annotation
    • http://boilerservis.ru/uploads/files/pudivewawebozoxisisedu.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/88630772635.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/6635884243.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/58195232437.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161372c62e7efe---32187935504.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9nko8820259adfh44htohvph36/78876138428.pdfIn PDF document text
    • https://fuoriscena.eu/file/83069587211.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/39296017125.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/52512134342.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/wofudeninusopetenogof.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/10397591890.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd0b2eb75---modozal.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/wilifadomotewilojanu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b9c2d8ce3b52fe75f84e7c57eb64b367/70639053568.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/75917443638.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/74612042901.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/35196911249.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/haq31md9qbdjgra8t4ovhor2eb/56614211683.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb7ca001---danupujubutebexuluzomeb.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210910050121.pdfIn PDF document text
    • http://favourtec.com/attachment/file/xovibose.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2a7a88edde01f895b20ce94e285fdba9/nigukisinu.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/niwegimezanoxawisarodo.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/92553190456.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_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 18008 bytes
SHA-256: 2a06daf67cf621661f5a3f33a1b6401ce1138ad013c92ee93493fb264f57a8a3
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 10828 bytes
SHA-256: ae5a9aa5ce7deb6c24cffdb9781ebbd447a97819a8ca444a8d45c4321f726dba
font_02_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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