Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fae8abb70d3170…

MALICIOUS

PDF

67.7 KB Created: 2021-09-14 06:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d99a14f7b784f134dbdbdbdae3e6a42 SHA-1: 8781dc0097617930f0037af12c013d4575c6cda9 SHA-256: c7fae8abb70d317017261dc7e744973334484f893954a10eca26dc362989e1c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier. It employs a common phishing tactic by presenting itself as an image-only lure, hiding a clickable link that directs users to external URLs. The presence of numerous links pointing to compromised CMS uploads and disposable hosting further indicates a malicious intent to distribute or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krisoc.ru/uplcv?utm_term=send+spoof+sms+free PDF link annotation
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130625dd026e---44177080365.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/70354030692.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/sanunu.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/bodami.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/12611744862.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff4099bd7---40188480825.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/03/94398248326.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c84863aac---44519694022.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/25469699486.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/tuparapiv.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/taduwe.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/vebubok.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613519dd84b35---9894789356.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/lekojalidimadowavibimekuf.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/85894926501.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/63928133496.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300afcb9f4b---nanufibiwi.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/2663270814.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/devudokotas.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/16934125919.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613780d8cbb19---pefolikazekobadajarame.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_off0000aeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C3 14260 bytes
SHA-256: ef208e2e1658d8d460f7e0373a29360e9ea8b867294227fcd047edc7457342dd
font_02_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 10336 bytes
SHA-256: e5c25d5a6a1a9a8f8cecd4267abe1c88e77c097ab90563317946ef4e4edb05d6

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