Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c1133fcd301cb2…

MALICIOUS

PDF

90.3 KB Created: 2021-09-05 11:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ce9671b6b34f3a102a175aa45b8a7a0 SHA-1: d0f01127360c3b3a438e6a4cbcd0585e1d64f9eb SHA-256: d6c1133fcd301cb26998183ab4ace45abfd016b37f23ce2c6d7949a584de8525
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into downloading further malicious content, likely disguised as an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://keystoparadise.com/userfiles/files/wepoguzadekij.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/98664fe9f2594a0821fe6b6a0fb70b9a/pitofegazawujojekoseme.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/45945295201.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160faf082e5340---70328758253.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/92206407038.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tnvosunhiao917edhbjd9anhr1/buvosezagebuj.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/88940821129.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab950d1f6d---vulilivodibare.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/62121284182.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/mezasejefalazepegurubamo.pdfIn PDF document text
    • http://st03.it/userfiles/files/98016987042.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b2a2765de---39976821522.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/53de75870cb79d0e9d882edc91572d34/baguf.pdfIn PDF document text
    • http://df-foundry.net/d/files/7754150972.pdfIn PDF document text
    • https://steammining.com/userfiles/file/dokuzogatiwobenunuzi.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/tivivubajarobur.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/97943478040.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/zabiredipilaxanalajiroju.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/88659855221.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ai1noceoeug0a6s0lvv536djb2/42090599113.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e93da309b6f3cd2d8f4d3558685b0eb1/pejofekijaxipujik.pdfIn PDF document text
    • http://praguetransfer.com/files/file/80535621499.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bf4a461b66943736ecbc9195f7ef2b3a/pawawa.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/23794827043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vauxhall+antara+2012+manualPDF 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_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 10324 bytes
SHA-256: 3f7e682442eb58690386cc1511b105e4bc163501c60134a44a8d19894f9cc251
font_01_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 19536 bytes
SHA-256: 4fafd608784d5c799c32c39ab34e9be3cb2d786772152698810c3ee4e7fa4496
font_02_sfnt_off0001436f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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