Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4707d88a864c76c…

MALICIOUS

PDF

89.0 KB Created: 2021-07-25 23:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c572618789bfd1a2ad4f984c9333fe38 SHA-1: a85d36cb94d9350e0e5e7b16beea5c6430d090bd SHA-256: f4707d88a864c76c75bd2f78d1b2a77f6eda4256cb055fcc5a52796a5c8c3e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection indicates it is a phishing trojan, likely intended to lead users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://pristineleather.com/userfiles/file/48532649652.pdf In PDF document text
    • http://imbirimbir.ru/files/48913016370.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/maq7j4j2m6e9fh690m6n9nebm3/tinitigonakokisezunum.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f529d7e59c34dee0d99b49b769242a90/nufavubefoka.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/73ab1dca9cdde5208f5381b906bcf401/fifiredevebafep.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/v24t64g4embtbir8e4ol87agvr/97072361090.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/77412397973.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/60250187754.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021529162851993.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160866990ce302---wenufitakusesuworoj.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/u7s7uau4udef93ckbesfn9k5at/xugogozu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6b62a8ad---vipumanateberewafeve.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a7052c87ae698517d20a48f522414f0/66564726889.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/lepupo.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/masus.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0bf0afdcd985e7febbf9a4c890c57289/vopud.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/26572089277.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/molupagisetujaw.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/g0m1k5fm2m0i6c3tjplsg1lp03/jawedewaratazowad.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdf0cu5kunp3mnrrh3dtt8rtca/nufusetupagosevufopiditum.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c1ded147c2e91cf64fb6d7644f3b749d/53918806143.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/44860787174.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d2206c74---vezatukuwazugefi.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/24697972744.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/73755894851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cephalosporins+antibiotic+allergyPDF 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_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 17128 bytes
SHA-256: 509093dd3f909f7e4eb199dee0a8a44d2b57f5063994d3ea94dddf26e4336800
font_01_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 10940 bytes
SHA-256: dfabeac41f3e2123a602f8e1ef6e6d0a8cbffcf8098f5307430559cec83e9ae3
font_02_sfnt_off00013dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1