Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e2e8560378be2e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 06:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b3828f3d77c4c3524882211e6ef39ae SHA-1: 46bd495b24c32b8bd7c141e347f3aa3bcd82c9b5 SHA-256: 16e2e8560378be2ed919e6a8d4d7e93206cb9213a2f8e59b42a7858156bc9b08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as confirmed by ClamAV and ML detection. It functions as a link farm, directing users to numerous websites, many of which are hosted on compromised WordPress installations. The embedded links, such as 'https://crewmak.ru/uplcv?utm_term=approximate+dynamic+programming+solving+the+curses+of+dimensionality+pdf', are likely intended to lead users to phishing or scam pages. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crewmak.ru/uplcv?utm_term=approximate+dynamic+programming+solving+the+curses+of+dimensionality+pdf PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0a39cef6e7713f38f9bc913ae0aae71e/23458301556.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b6d4dc589e4cde0fca201316336887f4/vagazet.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/246b8f09169e802f9dd7a578af2d3a0d/11564188886.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e5463c7f---26408532406.pdfIn PDF document text
    • http://playpenghu.com/userfiles/file/24812421886.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/32748741898.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/17944845079.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/83107031984.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/ritijinedovajuwekabu.pdfIn PDF document text
    • https://hse.tw/upload/file/16491793134.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c93d5228f453db5bb43106ea4781bf12/24387419095.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/35294987077.pdfIn PDF document text
    • https://numberonerevolution.it/file/lexuxumapejibazusalisod.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deb515af0b---pezapumovanokekapojemob.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bgohbt0ofi8q1jcnj0hoot4ml0/wakenojuvo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1557c92d3---60412933808.pdfIn PDF document text
    • http://teknis.it/userfiles/files/kupudemikazidujoduw.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7f43c3eg3m224070v5m17jc27j/fibozuliniwojuminolovi.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/teribobusemexig.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/84221777554.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0221455e2---34167813702.pdfIn PDF document text
    • https://egf.tw/test2/images/file/3017701314.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105110656475934.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd0c8e8d6---86943392522.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/gopam.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_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 17132 bytes
SHA-256: b263fb0e8f0254cf47dd8014b4ce0acdab8220888c411d123655af32cc4327eb
font_02_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 11428 bytes
SHA-256: d536aac3ad7d5347c98cdd9a15c16e12dad3f7c56a11fbee8ce57dabc7d5333f

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