Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c2e713fea15515…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 18:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab524832e9354cb2693e0d001acbd454 SHA-1: d7a77e5ed290e199ac23289c78c5e57a09fda4c7 SHA-256: 22c2e713fea1551539b362749849afbb41fc7b12174b646f5f81f2c3b020bd77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

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://crewmak.ru/uplcv?utm_term=clock+for+kids-worksheets PDF link annotation
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f84044af4---34247094453.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160744c7b61aab---93174678643.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/74619398786.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/dirodasojoxav.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/sr1b0t4nmd7up236hkgh0om0b3/41001302381.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124d21524ec8---fizoparunotororiju.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fepitipemazifarevabame.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/10001153802.pdfIn PDF document text
    • http://azizolace.cz/images/file/34355898714.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a109e7526ab---nidikelofe.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/xilabatutevofiwe.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/huv676p05cem1qn3l8mqc86fvn/87627165846.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b88638370---ditakewuxogix.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/goviwatenunigupizovib.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/22839917986.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/59276181664.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/svmdrgujalobvrmuskig1e85l4/98134778647.pdfIn PDF document text
    • http://hydrem.ru/images/file/wuzozidozopez.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210716090909985.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/595e01462646c9eb088143f3ca823f87/42660168809.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/2172305775.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/sozuxagi.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/47013097545.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/25633c7e2d7574620049e290b80cd5d9/28121667684.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/74894648206.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_off0000bddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 15552 bytes
SHA-256: 920a309c7c992b9860557c082bfe3e83b082f6cf5964af63252ce27f438ef8f8
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 10548 bytes
SHA-256: 84649bbeff6cb87bdaedecbc2830bdb441b21828efaa37ee0e48c41635aa0056

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