Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2fe42fdf80d368…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 05:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af091c227a91beb00bf88139a483c1ea SHA-1: c90b43a684581ed44da00352a0774102b7d9c691 SHA-256: 5e2fe42fdf80d3688805070bd1e8748128ab81a86ef8a234eb7e4d2d02325b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document structure and embedded URLs are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=phone+sms+backup PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0f977586---rofejajewisejasudagegabe.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/56340913538.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/fapezavikure.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/47544354194.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc96517a4d---javonewegoronu.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/34676844045.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/53522380191.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/kibesapeludufomozixoj.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/38673191225.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/vaveguwerisudon.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/28853316179.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6dfc40c5cdb8b94e8491485490000935/gixuwiwifamuxosagurilup.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/sozefixapusowobumelufunex.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/26424768940.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/56538308624.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/tuvabikoxina.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/nepizigakudemimir.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/pamaxo.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///ninaresilikew.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/fegokofogovi.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109121554161431.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210914190812.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109100123466474.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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 18260 bytes
SHA-256: 4de1b4509eb2c446f45d908dffc4cf8e589e26f696e28660a48333faaf05bd84
font_02_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 10636 bytes
SHA-256: d1cd41c09a154bd41d26a97f2dc5876f8f0b4af562a577376713cb4883c68d42