Malicious PDF — malware analysis report

Static analysis result for SHA-256 236c2b7c2ecab360…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 03:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d09d847910bca7d9d5b2cbd8459aded7 SHA-1: dbe7334a6fb846abd6c4ab1628f54d7ce039393a SHA-256: 236c2b7c2ecab3603a8acc25f8577cdd9eb543a00b83d46c14b4c21c2ecd930f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=biblia+interlineal+pdf+gratis PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ab5ee02a8585e187e85849e8d25944a2/58812361709.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/tuvatotesobiwo.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/35129392189.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/11181157105.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/27248722360.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/goxasebuwo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607289651f752---61833395062.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4eb2bd8b8---vojesizekupinu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a2df397e0b472fb092db1a5136407e4d/gubamodawojuf.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/rojedukokanipuni.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a300ed20153---vewiwinofozejemu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/g423c4uvn4ntpoguauedm0dfd6/zuzizukusupugipezisanotiz.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/11824359173.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/66510916550.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/68469506839.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/10254858774.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ec53172e5a07f853ae52c3f37ef9ade5/10033029752.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/97697531673.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc95a114289---56319532096.pdfIn PDF document text
    • http://alkanboya.com/files/file///33439586979.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5807b3c70ce01dde01057a786bb4755f/wurisadajesosijivobexug.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/o7r1cb94rqt2njahqc9djjp10k/kodudiniwopuxijetosuva.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/gamuvefem.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2d2282ee---86684686664.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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 16100 bytes
SHA-256: cd995502891255dfbcf4afd28e083ab8bfc87dc57603266f4586087dd25ac3fe
font_01_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 18996 bytes
SHA-256: f4c824cfd4f2b656533fb1bb867e12c8ca8833983f5d0d722e96c0fdb644972a
font_02_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 10748 bytes
SHA-256: 7736057fe8114fbb994cda70382d7c000bf9be8223cc00eee2bd303e194e374b
font_03_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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