Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc2c38e8fdff69d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 03:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 726049b6406d9668d18badc1ee0a9b2d SHA-1: 36697b260f1ebc9bbdad14b8de8ca0d00b5b9b4a SHA-256: edc2c38e8fdff69de9b4266a92adb131a9d9125a9d7918977e1600038020c590
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this is a link farm. The ML classifier and ClamAV detection confirm its malicious nature, likely serving as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=justice+league+tv+series+torrent PDF link annotation
    • http://optykglowacki.pl/obrazki/files/35818702107.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1d48627c2---kepeba.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092320200541.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/momaliwutesibedeburod.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/46345240376.pdfIn PDF document text
    • http://sb-78.ru/files/file/95480417501.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/81559973193.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/57469097778.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/56125903007.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/ximegilo.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/73352098770.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/76445694732.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f09bba51ee27dfb1fabab5b563d3b9ae/pisus.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fijugapavuditerusodeg.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/88809552146.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/rajafavatazeji.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c5da2bd2a---10114998181.pdfIn PDF document text
    • http://torgoborud.org/images/file/62673085953.pdfIn PDF document text
    • http://mallncart.com/userfiles/files/60168238902.pdfIn PDF document text
    • https://laps.pl/userfiles/file/39656505497.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/34028793974.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae54b62a86---70089344529.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613936c7bff15---4688002876.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8899ea6---70952933677.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/mapoditolife.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sakuladosomarawag.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_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 17556 bytes
SHA-256: 26fbe1190e3a0e121b172f528a5933ac5ad08e39f410282b2dab187a3293215d
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10564 bytes
SHA-256: 5c7308b36e2bbdf045987e90e6e37be28be28d3513703e460354c9be1b8c7cdd
font_02_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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