Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd95d9d0e181e86…

MALICIOUS

PDF

81.3 KB Created: 2021-08-15 14:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d6d1f2d869acb8d22f7d7410f349cb8 SHA-1: 4446e2e50f05df7dfdcaa4d88e3868147751bd51 SHA-256: dbd95d9d0e181e86a4f8ee84ea524097b91e6addbedf01551a987891c5743b51
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting and compromised CMS uploads indicates an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=crema+para+piel+seca+y+escamosa+casera PDF link annotation
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/71375197b440b20ab9364cbe2e4f75f1/tejokujakovirizidusuj.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a0eb3014---lonurataxuvi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85bcbdb0af---61452992022.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ba14f1e0---17886953785.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/52462486307.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/907db7780cdb220c8d21550af5731764/wizabazumudosinodusikuder.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/94236488759.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/09ghmn7c34c2ug1e8drh0e3hh0/35303577377.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/27588054028.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5ff28f36e211f95f512bac308592a9fe/59949323678.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/97753504639.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ab81c7c1---wumipadunotazibapubipof.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/28711741435.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c7cd27acac4f0be627c843dcdcc6ed5a/mifedisofejex.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/15336557257.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/ruxelegolewakipixap.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec01804c---detasarilugenozuvar.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/6269076248.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/zewizefekapol.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/80700743268.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/39625576137.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/38155942833.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/96596576996.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e22b302ad316a2f67d381d873b2c2e19/90234949176.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9f2c94721ad958b42ec4ca851d97f4b/mobedemizexisirivili.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/69889479200.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 17220 bytes
SHA-256: aa1522b3be594df7f98b1648c4a737b3d35a71f7d0c1d9a752286db186301634
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 10480 bytes
SHA-256: a62f9260e4e27feaebe1a1ce97f24f5af96bdcacce983c813a0fb14ceb1bf198

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