Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b0d72dd6410944…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 23:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 304878cdd94b0c8c4e3a5985516d09a9 SHA-1: 5d2e1317a92e580c497333d4595b907f8f2984dc SHA-256: 64b0d72dd641094417aa25c2335cb0bc24f940163af4fa15a528237a7b2a5d3e
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=laurent+series+examples+pdf PDF link annotation
    • http://centrumbiznesurawicz.pl/userfiles/file/340174817.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/dca328abb9d150d21211c648de058702/55827541805.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/55291493226.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/60647610778.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/78660487334.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8904201a3a---jevejurok.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/74ab85d554450d67c2076f7411124551/meweregevusesabale.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7424a6ccd3e456175a38a492c09a05f8/lasosotabobijomikeko.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gmu3bjqdombs4fubn633o9otm0/wivekosuniku.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/22261937414.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/20251088187.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d52cb05edc09e68161e958f4cf797375/toxopawafikit.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3q3gldg5b3hgaclhejfdoqo5pf/wovekaxedabijulodanewip.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/papejinavakanosufenazikim.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/67131605771.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/nagexuvija.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/lomow.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebe2bc54f---jiloxe.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/zetewalimulamom.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5c7b1de35---nonajuborakosadifuv.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/4721330270.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/nukeroxosedusune.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/10994533232.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/40683863799.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_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 10696 bytes
SHA-256: 4e241b0bdf86435c24b930d5a6001d4c253272d8ef8ace6e08d478822856fa84
font_01_sfnt_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 17920 bytes
SHA-256: 5ddd74971e8d26d3e7e51b4d6797e69f298b1dadc0736418e404c6edba8360d0

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