Malicious PDF — malware analysis report

Static analysis result for SHA-256 859e4237e6172842…

MALICIOUS

PDF

97.4 KB Created: 2021-09-08 03:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49e3192840dc0e55e89c51552e874b72 SHA-1: 3eff573abcd631d88ebc9d5b3d2ec6e3eeb4a049 SHA-256: 859e4237e6172842228e6603efb9323b2f7c4a1a246bfd5276a0a1e08ad3a0b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=communication+system+lab+manual+for+ece+regulation+2017 PDF link annotation
    • http://chinalanpa.com/images/upload/File/91434975762.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/83285289303.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/xuzafakokavizaso.pdfIn PDF document text
    • https://sanidom.pl/img/file/30222091002.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/79110915347.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e324838c7---59597648798.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/getiwuxutedam.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612173ff3df05---75134243118.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/34014117910.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/kifokuvuven.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c068eb9254---zajuvelavub.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/pewexodovesujaguwatux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116650aadbd1---67254743542.pdfIn PDF document text
    • https://mihalex.by/files/files/defipevuvapopuruxerowo.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085d79f4c023---38935095006.pdfIn PDF document text
    • https://123natura.com/stockages/files/65620870139.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gexivosigitapum.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/cba3iag75chn0edm848rkos70a/233341847.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4457376e---12532415899.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/wubowulisoxefefutunowaru.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2424e463---pegiwaguxozagikexuv.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/duregi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/slmbiqu6a0s7hj1slj15fa450b/lonujuda.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/46999593066.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kiteven.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/14598029122.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_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 11408 bytes
SHA-256: 598197dc43fa792ecbb3e006ffa481a417db7ba7fbddd45a497f9bb6db651af2
font_01_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001461a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461A 18772 bytes
SHA-256: ae66e9cfc19be3ae0c4bfdd54e90bf973fd96622e6c928943fab16b5bab46188

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