Malicious PDF — malware analysis report

Static analysis result for SHA-256 0083676c3b6a8887…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 23:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d58d7e802597a6ea48e35cbc5721ceec SHA-1: 9fa6590f2c12c2dd2bbbcd5d374f8abd3a5b760a SHA-256: 0083676c3b6a88878c1a486b17eadc3f78bc38d78c5ee22b5592a05da7ca8d87
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3958426ec---69790146562.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u8vbc0mjhfl6v076dqv5jkr16q/38004414963.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/psl1sadm71ik5pmesd9q7ot8t0/gudiwuw.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4dc8b4124---6817424644.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/59043060572.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/66784301338.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e06ccd4a2---dozuzureduw.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ddcd8bfe---xupuvapavupikedurunoge.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/66320304996.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/pazisalatafefo.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puvabo.pdfIn PDF document text
    • http://dd-eng.com/files/files/mupom.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/80138354088.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/34303869849.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/69118752804.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/52514464fc7d6b678b5fa07fbbfb688a/rodiviwegogurorelot.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/tosedunewokinakusademita.pdfIn PDF document text
    • http://artside.org/data/temp/file/4515511712.pdfIn PDF document text
    • https://menu2uplus.com/images/file/63435168463.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161169661117d6---38737137452.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c754c990---lafifatojom.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/lawawifutizig.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1db0b51f---buzanikikewijuwuwanorozo.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/19011536652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=suzuki+vitara+2003+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_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 16852 bytes
SHA-256: d4f88cd7f9d80edcca92e51e345d01b21255110a7449137e209caf16d1f048f3
font_01_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 10656 bytes
SHA-256: 8459655cd58ee660bb76c28f4c06200e7373e21a0bc7cce503a2c27d5a0a0b35

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