Malicious PDF — malware analysis report

Static analysis result for SHA-256 2072c8e302c630da…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 17:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e646b2ade40ca894e2ee177d43f4e7aa SHA-1: a56143cf32e8121f093d1f17e005b5e222940f9a SHA-256: 2072c8e302c630da309841abab2f3bd66b884d9cd928ccd1ba75cd4579657a04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=gta+for+ios PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cda46464---pumukowanozorumipi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137eda1a074b---84670575451.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/gosamuxorotikojupex.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ae05939e1561abb0ab32176631be5b04/lewisoveparu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nokumebotuj.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/68949381143.pdfIn PDF document text
    • https://camphacement.vn/upload/files/19859112972.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/78503943815.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/wipawopozixa.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jekoxoduk.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/80741938309.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/20376124174.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/20651562744.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/46166012407.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/71104262028.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/wakataga.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/64805344366.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sabovujovebe.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/gosowuwosofekejolafox.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/18663512769.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/47010821059.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/betarixugirawuzawededet.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wapoli.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/mezutowe.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/paxedokogunowevoju.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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 9964 bytes
SHA-256: e8d73aa1505502c8e46f7c6b7e7985f6569381742674aa763a8d59838fa5dd22
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 16716 bytes
SHA-256: f8b6fd68b021374244e906907a706d4883cee32e1535e9ffd5e0376d65b9f15c
font_02_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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