Malicious PDF — malware analysis report

Static analysis result for SHA-256 571dd0d07430639f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-10 22:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b643767a971e3859e7b47025496ab22b SHA-1: dcfd2dad2b0abab0b4514e1ac23b9533a7c6d899 SHA-256: 571dd0d07430639f7c3e53f6532c99b8edea60bc1b3552529f422735c68b49be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised or disposable domains, as indicated by heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or phishing. No scripts were extracted, but the structure itself is designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://mhreng.com/userfiles/file/26475133751.pdf In PDF document text
    • http://minhledtran.com/luutru/files/jisat.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/40017519119.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109051218532581.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/tibina.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139237ef2d4e---1203908895.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/wapofejanisawifiwakufuwe.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_7F8A2AE4E97F8E4E.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/40073544142.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/57553505591.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161342aac255d2---xetizepujoribijajisafidot.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/papegapegivojijawu.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/tawofakewomafi.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/ruzotakubitunaka.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/55334091288.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/xosegiwegorosuji.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6ee8e9569156c223b38189a9847f172d/45720900039.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/amutnqb8nj61c9usq398il11q1/96204602364.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/19036853292.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/xefuxalaxum.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370137213f3---dilubofafufagelixugoviz.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513cf036e9---15809995078.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ae4419aba9---ravuwimasavaferepojebeziw.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zozovixolumesepu.pdfIn PDF document text
    • http://esistore.de/userfiles/file/14627641200.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/lawamelofuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+san+andreas+cheats+androidpurPDF link annotation
    • 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_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 18448 bytes
SHA-256: 25924e5a5cac2b26cec4e1222b534de5fe8bf8d236cb514339e24161b6e0b3c0
font_01_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13763 10704 bytes
SHA-256: 594abee111da7e9beea04ef1f4a7ee482fae43df0873eea7e150b45411f4b2a7

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