Malicious PDF — malware analysis report

Static analysis result for SHA-256 624639de82e9e9e0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 18:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1a4f2c97a5d4f775c39fda21bc3e5df SHA-1: 2b57c5db05cc30ea802b3e3713905ea06b9fd2f3 SHA-256: 624639de82e9e9e0caea2ca31ab2f06c59309316b9afda55facc1038434a26eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript further supports its use as a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=big+bang+theory+season+8+torrent PDF link annotation
    • http://www.pilartangguh.com/file/gupamuvudukowawuxu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/ladoweziji.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccfb06107---poxabomuralos.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/82989416380.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/58637174680.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/53567883967.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f73d04a1---jigezebasozulutisal.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/rujatodep.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/vixubowilewirosogafamoj.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/66749944578.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/75703395060.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/xazalofadepedopivi.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/wonajasokek.pdfIn PDF document text
    • http://ahchala.com/img/file/luvufironudotejekibosidu.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/2687844204.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/voxafogutanupatinekid.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec596ce30b---76737646990.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/82786313670.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/xikarojaluwa.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/86620889525.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/25073162168.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/satupawofepasimamuzu.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/12852283108.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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 10856 bytes
SHA-256: 1ccdbe9ded0310e68d67f7a9f3092b5adb9da30fd650ac77c63858bdcaf26173
font_02_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 16072 bytes
SHA-256: aea835755fa4ec19c964e0665dd3ca52d9dfe3457dfa430b75aef5687b75898c

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