Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e0f4a87a1a42e2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 04:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f10835359ba69b77fe405f5664415a77 SHA-1: 77c55338cb491799e49341041e3785d1d3cbc547 SHA-256: 39e0f4a87a1a42e2465375377c1934c3b67f2599fdd2859b73d1c16f7fc688af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=latest+telugu+movie+songs PDF link annotation
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/gazakaluwofisav.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/86630461434.pdfIn PDF document text
    • https://subded.org/userfiles/file/6277164033.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08abb6a9f---vumematamifulisarobis.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/tikosoruxokot.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/welubejezupafagefifabus.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407ea0aa453---febaf.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7882e0c242d8fbf0a00f600b5c4a4d99/43938764035.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/92069287129.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/41092635582.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/xejimadogonetuka.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/woleg.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/bovilejazexilulavude.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/towoxuwigoxejunexe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7941ee57b---79767310891.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/83657655012.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/xewasikasa.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/44470309313.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/12944253990.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/lokidazoxomebuwifopagire.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/goxefemoxirevur.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lovizanuzavunigakimasa.pdfIn PDF document text
    • http://health-bridge.in/upload/file/80977463412.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/37669854824.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/1287159932.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/78859496333.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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 17872 bytes
SHA-256: 62a57495521f4f1b23259d8d68e1bce1ad8a8594a176b750731c6f5628dfa36e
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 10472 bytes
SHA-256: 083aefa6647649b7733a904d1f10b5ca00b56ea606ae5b678eee80ab11d9e11a

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