Malicious PDF — malware analysis report

Static analysis result for SHA-256 72475304519eada3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 14:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88a83854f040908534b5db0f546fc096 SHA-1: 2df1cbe1d44fa11c6e197ad3a7d970e5dc2effd3 SHA-256: 72475304519eada3d089f34901b030c1e2b3058ee62d345c0cdf083350f91b04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=windows+11+android+games PDF link annotation
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sazulamivadojawerokipej.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/36122088356.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109020259261611.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905040537831754.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/10471116930.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/soboniputisupose.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0ec297648c2540c068cbba628502b8a8/54538958386.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/nosenepesejezumuverexoj.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/48140328678.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/20661540877.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/mapimapetines.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f61b5c6439---rowugapo.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/binoladunuwi.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/sobav.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/zapasik.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/16768640650.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/lixoxat.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c15a7ff5---lapojuzuxoli.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/93741079188.pdfIn PDF document text
    • http://mebco.ru/images/file/97521327582.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/rizivifuwetobon.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/kepupukasedikilelugate.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/valev.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/64748364619.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8c2a0c749a17750595056b39f7988ddf/19788168653.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/46331143658.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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 17472 bytes
SHA-256: f613b1839b6d99f5de99bfb0a71060aafda41ef8f1e55a53dc66644a07837c57
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10576 bytes
SHA-256: fdbb8dcc0021d563f1a8ddad0ee4c0ceb24d72cb3b7388a9b3d2a4edcc98c971
font_02_sfnt_off00013119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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