Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8357e77057c892…

MALICIOUS

PDF

112.8 KB Created: 2021-07-02 10:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e31d492c6c8690168fa98c7ae6f8d499 SHA-1: f0c8d973e4ed336f8189fc5edcf7cabb264ad424 SHA-256: be8357e77057c89284a8a97a51638efc1309fe88aa6f9bd1afd0bb0ba8ca278f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6ffc450f---18989691911.pdf In PDF document text
    • http://kino-cosmic.ru/sadm_files/17214805712.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/12248356126.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/zavegaru.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/kelugevosafero.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a7dc3372---wemovamuwiw.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/pugawukibamivitute.pdfIn PDF document text
    • http://amandamaitland.com/images/file/36917843462.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ld28md0crvcf7rhod6r9sefbvj/wusanubejuvodepesado.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/49b00e8e0b6f114faa94abfae154b942/49961611765.pdfIn PDF document text
    • http://www.bash.cl/media/file/8326538359.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/67775101186.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/vururexemeda.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/19d9j0g2n28qsdnf0khmjn7fhs/32712149869.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/laxapije.pdfIn PDF document text
    • http://prosquash.by/data/53000413708.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b41d97d27a7aa8c68d3aa8d879101a0f/fonamuketelupibujosi.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/45487900325.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f186ee4f7d471b6d60f50cc70793196d/jugijujilaziloxoxo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/a96d1o8mo660kfg94unavenna0/69862493589.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160871d695e14f---fodimokigubapakogazubunom.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd6a15e04---jejiritidudesemo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d6a05198---41721976647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ophiuchus+brightest+starPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 16232 bytes
SHA-256: 338cc954a946a7fbf70b29c55d5e66db99b2ef151e94d540d22e7b387f44db23
font_01_sfnt_off0001477b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 22940 bytes
SHA-256: f3fc98c62b5484e39c3636f3e9c8cf1caa858064217d2d377b074e46bf940fb2
font_02_sfnt_off0001836b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1836B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B82 10648 bytes
SHA-256: 371a8d6d1b802f764548ada443facb9d903fb93b7676c1749dc3de5c376ed65f

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