Malicious PDF — malware analysis report

Static analysis result for SHA-256 2143670a144cc369…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 22:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 90a45d961e1f093665474bacbee973f9 SHA-1: 89398dcadc1453bc4428ba7970a8724f819d0927 SHA-256: 2143670a144cc369da97500692626db751b63cd2e898c09eaaac165ab05e4eeb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it contains a link farm pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs, including one with a 'vice city game download' UTM term, indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=vice+city+game+download+in+android PDF link annotation
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/nemakanutuxap.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f20772eb---gitedowopat.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/87177298336.pdfIn PDF document text
    • http://mlight.cz/archiv/file/41656292453.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jetofikokaretejigitaj.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084d60f4a207---15367260590.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f915831f---duwipasirame.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pegudomigir.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/36899967122.pdfIn PDF document text
    • https://slide-bearing.com/d/files/76548985637.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/kokugifijopiki.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/86fae9b322a072c8cf0691917c158d1a/24827165963.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078000c533ed---69355486748.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/vudoxusebadanakuxibi.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/mefexagoxedawi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ssp9llgbeto104om300lvv2op4/72922825056.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/18265343829.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/28483774606.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2374b2f9---wunitupuxodalelutewivaz.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca048f39f---28387203700.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dlk6idp2fokmqn58mtqc46uva7/5759263800.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408306129e---xunerejarozubupi.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/defubuxutuwukivotejomaf.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7269aaedda95969982981d70a1bcc8a7/kenikujuk.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/49187df0eb9bb4996b73b83fe72f3c25/mokuzisukowevanidilarum.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_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 17100 bytes
SHA-256: 74cced6dadf8ef957d1c9f73f9e0af1a00e027b947c578e6f7077e298c0edc4c
font_02_sfnt_off00013fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCA 10712 bytes
SHA-256: 1091d4fc48164f70d39ce69bcf78636d222f7d8ba91b949435392bea27b4c70e

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