Malicious PDF — malware analysis report

Static analysis result for SHA-256 90377a9974785886…

MALICIOUS

PDF

76.7 KB Created: 2021-08-07 03:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fdbd38c6b581923784358c2d9c73b60e SHA-1: 32b5afba4ae88edc74c14d03bc048b98e4357d14 SHA-256: 90377a997478588607a54c801f42b760063c0d18e62cb8e582a8be2460773910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://irlanc.ru/uplcv?utm_term=libro+estadistica+para+administracion+y+economia+levin+pdf PDF link annotation
    • http://jan-fotografie.nl/upload/files/40438077948.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/33871464093.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d18pq6f7rpk54arng1o8foo7cp/3319140811.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607030d5d3de3---70947264823.pdfIn PDF document text
    • http://teraval.cz/res/file/26792582994.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/5282773471.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502144655923286.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/gubizigu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/58f297ca40c7dee9447fb945cb43a35d/68902025307.pdfIn PDF document text
    • http://rideco.hu/upload/file/29817200642.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/jorana.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/7719329902.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/59677061409.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/vodesopomedom.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e51963924e9---91459437342.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/sukufusimemunumagu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/cf8c4a3e13148dd82e79e46a3efcebe6/deweridemiboroz.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/vilitumozadakexa.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/pifegotoxirulokixar.pdfIn PDF document text
    • http://uci.ir/userfiles/file/69774656607.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/56m9k07utvc0paskhe9g1m7nk1/dodurivogawivowux.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ad9cd6v2pg35o3aalrt3k6ak44/67953493870.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/lekuridiwigefelerufipez.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7544506e---wejegubenopifoxefa.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B1FCC1E83A1.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_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 11060 bytes
SHA-256: 68262950d5fd28c026ee0cd81bb9d5111f1d81812835c25b1d3bb715d67cf14d
font_02_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 17136 bytes
SHA-256: 1ce48a4a534614e8813aca01558047c123c30d6764cddf9d526e0b11c54bd71c