Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58f52f672d2802a…

MALICIOUS

PDF

76.8 KB Created: 2021-07-28 02:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f4f24d29f3ead39897d2fbc1d7d85bf SHA-1: 73f46cdf5508641149de0ee510c5c502e6eed4aa SHA-256: b58f52f672d2802ac28560917d67d6351a3f7b14f529ea0dbc504cfa44715bee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d96fa0bfd---68795573660.pdf In PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/vosaxaxoxepava.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/53763625961.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4dca75501d0e839da194cf1aa3c1ea72/zilezodesivebunofatavi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609065805fd82---40662589984.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af931e33a5---tutunuxugenisiwe.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1abb871bb6---jinageneposorutud.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/81627163494.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfa129a0f4---gikojubopemejimepi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e423ebb27---xoromofawajatuninibiwog.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/jevugunofixuvimof.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f1b0a81c1ea5d19de708f7f3ca74cf49/38309947307.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/lurefokufajoso.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2ab7a3da---sutulevijivupejegi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094147ac6a69---fasegu.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/dotide.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/13357387536.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/88115830899.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/bizaxudojazefemarapu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4b4bf1ad---derarefibatex.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5h9isqbsh0h8ueqgr4921bh1a4/31186804095.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/nobejixamewiwarukuxaro.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/48212251215.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9164d73e---votedasogosozawumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=biorreactor+de+tanque+agitadoPDF 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_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 10628 bytes
SHA-256: 853879efacbeb2b0cb635353c649841ca2ce29d8ee0c0b19a23fbb0aa31a9d0c
font_02_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 19008 bytes
SHA-256: d01b8ca40469cfe2ed1a11a6f9e44dcacf9a6ce2cd679066fa99b82d56ea45e3

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