Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf90e311e2a2380…

MALICIOUS

PDF

98.6 KB Created: 2021-07-08 12:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a627ded0d3a80a1ef8d2a05c01aed111 SHA-1: c8976910046aa869d762a57d4c340fb10d6c43a6 SHA-256: 4cf90e311e2a2380741d3268e587e3c1f32e93379f33f4ec44f2c3aaf848bb00
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://queure.ru/uplcv?utm_term=state+and+props PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd497460e0---11989182773.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/62599731344.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/53ebf0cfb2ca54313fc4c564b1aed23c/renilumabe.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/578ddc6728eb311d38a1e75a9ba29a8e/nulafimozupe.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/27594027424.pdfIn PDF document text
    • https://alutat.com/data/file/36335050306.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/tavogunolusipew.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wimufoxanubijaxe.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607892903ac50---puvalagarivepapiputojuni.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0600f3b101---75149687064.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/59000257688.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/fawijadezapal.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pvp1n6udbpb8j4otochiatlak1/85024772962.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae08668f3---kutajadenepiveguzojaj.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/delujofikamisibisitanator.pdfIn PDF document text
    • https://asiahijau.com/contents//files/dopipoxobekiw.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/52f5483f6c878c6194a3c294cbe6dcb8/sejibukugemotolorevut.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b49098356b8---sililidefe.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/36129240106.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/36044503889.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/08a1d8ab6c91eda3c211a04fddb49e53/96480835010.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d0173ff2cc4f45814ff5f9c4106d8f89/47842692435.pdfIn PDF document text
    • http://vodnik48.ru/content/file/poromutigixabixi.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/9124259388.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af75d70a25a---52892764393.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ed769285---24888194966.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0ee51cd15---xevenefalopefivulefito.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 17664 bytes
SHA-256: 8a2ce6d8ab1828f053f09a62658f5459df41dcd59379b60a57effd74cb0f46d0
font_01_sfnt_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEB 10324 bytes
SHA-256: 091a251c8bb9e61432325821b40085b6bb65cd464ccd1f2c3ec7851ad528a698
font_03_sfnt_off00016647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16647 16392 bytes
SHA-256: e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e

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