Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec25fbced7c7197…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 08:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24f66fa20111bffbb1e0508b5a91d016 SHA-1: 416b216fbe7aa9f3446e9bff9e56d8d03a10f1ff SHA-256: 9ec25fbced7c719705f4ca5eef89a19df58ef9a955d5dc57cfc9cf2eb269bc0c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://doremimarlikinsaat.com/userfiles/file/vijulexojegisun.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/a41c3f7836f6335ccd7d1a73a00b878a/lusirufop.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/42850696450.pdf
    • http://s-pack.kr/userfiles/file/20210911154555.pdf
    • http://tydafa.com/dafa/uploadfiles/20210915134852.pdf
    • http://investgeorgia.ge/userfiles/file/dilelizev.pdf
    • https://augsburger-dartliga.de/uploads/file/52822310210.pdf
    • http://henzefashion.com/userfiles/file/6790241173.pdf
    • https://f2h63c2.ip4secure.net/upload/files/gadewetanotaf.pdf
    • https://trsoftyazilim.com/genelresimler/file/sadawawigefepi.pdf
    • http://moristas.com/userfiles/files/92979032816.pdf
    • http://hakasasi.id/userfiles/file/bokonogowatodemowuleru.pdf
    • http://budaors.varosom.hu/userfiles/files/928699632.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/30129978432.pdf
    • http://pmke.cz/pictures/files/tejunerowirabuwunuti.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d359f8c216c42f8bf55fd83ee21495f9/75958840443.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161304c78dc6d8---48051438858.pdf
    • http://mawratanews.com/armedia/uploads/files/7545605709.pdf
    • http://posuni.com/userfiles/file/36350484107.pdf
    • https://goacetours.com/ckfinder/userfiles/files/80088460007.pdf
    • http://hondatayho.top/img-ngocbao/files/misogivotedudufolozepu.pdf
    • http://gardensyellowcab.com/admin/images/file/godazanodenuzedesikid.pdf
    • http://gu-bo.cn/uploads/files/xemekonuzidig.pdf
    • http://brenna-ski.pl/userfiles/file/96732329294.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tekken+8+psp
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 16792 bytes
font_01_sfnt_off0000f4aa.bin
ee7c419755c712f2e45a344f004ceb8b903b6531bf65d55d35294627584a1f4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 18720 bytes
font_02_sfnt_off000125c1.bin
140119ba6577da8a9dce5f571534c75989efdcd73052ad399b623538222f4d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 9888 bytes