Malicious PDF — malware analysis report

Static analysis result for SHA-256 082a786b842a50a3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 16:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25b26b8ba00d80290b8dd675bcd4d20c SHA-1: 3219ab6555c81aba6c6c272788df25ff6a846c3d SHA-256: 082a786b842a50a3e9c47e3dd6813bdaf6a5ba44e5de1b26b239f146c2db12ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=comparing+integers+on+a+number+line+worksheet PDF link annotation
    • http://biomisszio.hu/tmp/pupivena.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/tovalolajuduleguduvaf.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2vqeh7rvtjom0bbll26bf8v2ti/dofosizolusiwifulupuf.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/04d4d9b3862d6c03579fadc62e75cb14/tapepalob.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb56bc2be---12905986459.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210520001207.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/33396897880.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e071a690f71f8149b7dfb5275a35755b/32877885555.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/82067119341.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ffb4e243e---wawubibiwawewiw.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/wodulonubuwavowij.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/rosumino.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d1621142e---lekonavexir.pdfIn PDF document text
    • http://quatang3t.com/upload/files/57165143967.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/39294581623.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/nirukajevilibo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6d6c2f27---birusuxavunaw.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3fcead5e---62278425743.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/21588419027.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba957892c05---70799246748.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/77865319643.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/69173677944.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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 11148 bytes
SHA-256: f4b273806e7513a884e9c02d0b52bf427a1ca297bfdf689e474a5304ab55c62c
font_02_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 16956 bytes
SHA-256: 1b0cd9583433a16bcce541c77739e9697d08b6b985f4eb451ec99efbdf1d2f89

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