Malicious PDF — malware analysis report

Static analysis result for SHA-256 4105a0e26060bbb4…

MALICIOUS

PDF

91.3 KB Created: 2021-08-07 12:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0fda90c5aa8f2ddeb22934550d51ab62 SHA-1: 37b66e402efd2a7aaf4271cabead796c12a9d153 SHA-256: 4105a0e26060bbb4c65d7279fc4708f7acfef365ffe401d09c242d0b82262229
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous websites, some of which are hosted on compromised CMS platforms. The presence of multiple links, including those with UTM parameters suggesting SEO manipulation, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/95202877196.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/lpineven2pfq13tun4l596o1p3/78529499729.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e4856c236c2b012f33d8d2d2285b9ffd/86675828001.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/f0f7a3cbk2smlaafcn9psnqbfn/jebem.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/wegejokabel.pdfIn PDF document text
    • http://crm333.com/documentos/file/rekutufezeguwijuwijapomuk.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bde69813160---tebur.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/365523db50f1b4b3397eb722252e40e0/11696073747.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/67112699261.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/54199870306.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08df9af9390caed2f73b4e5979f82a59/40905971032.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/63270417399.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fe93c8e0d---tepejunewavetalotipam.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/17837961618.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///83813746820.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/jefukawemutixaveras.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/15603106229.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/97846902953.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/p2t4mebikuvgvvcnvg64tt3nki/zubosegutusa.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/10910074748.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/junojipuxamidoripirasulo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ba46dca5af25cb642891cd85d2d872f4/xuposudikaso.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4184399d4---xumekuzebigemutakup.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///muvan.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8de6e6c75f44004c50ecbf9faee0a277/nupuxepetakuzibajexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=epson+printer+adjustment+program+free+download+l360PDF 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_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 11600 bytes
SHA-256: a0d81f854adddafaae113c99778de5fe78daf16808ede369b5e70384c835544b
font_01_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 17608 bytes
SHA-256: 4becb737c55b5ed7548ce6e9c99202c5c4c876366c9d14187c9a491564d2846d
font_02_sfnt_off000145fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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