Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2e42d951e040b4…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 14:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bbe7e547a004610912695b1fbb95c008 SHA-1: b65b680a08f09b6bd323d153a3141582ec8e2f66 SHA-256: 1d2e42d951e040b4359794a17abe61200015dfc536d4537eaecc1f8fb360d4f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=english+war+movies+best+full+movie PDF link annotation
    • http://ms-beauty.com/ckfinder/userfiles/files/81423561685.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/89426957079.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/ketipatitipuzagixikukotu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4sapkia7nl80e0q48gm0m6bmd/8157413167.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/juxovepeledizufatufepi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2bee145d840db2d927b4584c552bea92/99430635167.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142899b9ba6e---59262783920.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/71005096085.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zegepusopusika.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/dobogujisejifadore.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109110038329069.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/wedipoturotasowuvajanogez.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/67613397149.pdfIn PDF document text
    • http://myphamasia.net/upload/files/33468026273.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109090120184942.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1ba342c263382e6e9a1986c95025c33b/xidetirorofoxavatojod.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fae0e7a9f787f9361b3c0466f8d0c12b/8792569133.pdfIn PDF document text
    • http://thaide.org/userfiles/file/79085579929.pdfIn PDF document text
    • https://businesslife.com/content/files/44558764419.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa66d730ea---tegavisiwiluweluj.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202194_192959_210.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/jalevituwikokoxupo.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/10165443776.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/52237529619.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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 16916 bytes
SHA-256: 31bd7cdb249d6460d3f451e1fe4bac8fcb0436feb23ad559f99b0807b11e567f
font_01_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 11036 bytes
SHA-256: 7c4be9720dac8892082ebd9a340164e57a06da00f3988edf8b2ba6a87c9cc260

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