Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1105a78e860d5fa…

MALICIOUS

PDF

69.5 KB Created: 2021-09-03 02:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b853f35a677643680e231028131d3a2 SHA-1: 63fb6d7cc2e2a8017cf52973faa6d60eb7a387ae SHA-256: e1105a78e860d5fa3c256015945f0a2ba399566f079af313d335ac5b891c7c6a
176 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The 'PDF_IMAGE_LURE' heuristic indicates the document likely uses a screenshot to trick users into clicking, a common phishing tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 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 http://3bbb.fr/ckeditor/upload/files/70302363378.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c937e113e---sagelitavasejuguxunu.pdfIn PDF document text
    • http://xtra360.net/campannas/file/6609333030.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/1882858248.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/64285534741.pdfIn PDF document text
    • http://ingore.cn/upload/files/24773390781.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ebfb6fd38---92846743759.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/63289363838.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/jopeduwer.pdfIn PDF document text
    • https://ms01bet.com/contents//files/7499371027.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/5101136493.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qvc8r4jguak3cmfccsui23bolr/67139583786.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/82861162011.pdfIn PDF document text
    • http://vitrine-prof.com/files/40573245200.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/82886367933.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/losusaralugetaliwevi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2b11e438---riradiruxogazegape.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/27850230345.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee154d6ae---xarokefagalotix.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753e565d22---gaxub.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/vivero.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/kivevukiwinid.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/024b33ab4f5e430f73003bab5b7caa27/58980091764.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/govotofazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+printable+friendly+letter+worksheetsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 14428 bytes
SHA-256: 4b0baba6fafa3cbcd56214d154cc1005f7340f00bcda4b660e0889132b74fae1
font_01_sfnt_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 11004 bytes
SHA-256: c87894fae93cc32dee7aa5856d56340b3543966721be1c22f737c3bf8ee2710f