Malicious PDF — malware analysis report

Static analysis result for SHA-256 90566372fed779a8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 07:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a858dd728347e28c48e248d1ad32c42 SHA-1: f3baaec5e024ead8b1443dd7db619666abfdd20e SHA-256: 90566372fed779a801c364689b38268d2da106dc1e2c6d56e8bd29bae3aab12f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics indicate the PDF contains a link farm pointing to various websites, some of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=lamentos+pixinguinha+pdf PDF link annotation
    • http://colorfusion.us/admin/images/file/36803491800.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/ribaputonufamape.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/bopimiwolus.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210518053141.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/49859297272.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/83648329756.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/tufinuduxixidazeg.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/95607026337.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/54306f21adc3620206b7eb9763fda7cb/89604121693.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/23951647227.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/k5c9bnnnmjq5jgd34pjgjjq32t/97972901561.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/dozesu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/12369697984.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/43746511668.pdfIn PDF document text
    • http://rsentco.com/upload/file/26031230268.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/88465364401.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/norevenatusatid.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/44583128481.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b0c00bfc---xaxatilolugibugitok.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/67307439679.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1625e3177---53755870593.pdfPDF link annotation
    • http://nsk-nalogov.net/upload/files/jufaboserasofanaruviton.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/betamefa.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083df0c3e2eb---jizuvomug.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/tixubigufexe.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/6861623797.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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 10960 bytes
SHA-256: ce309f1733332a7b930b63e89d94d7edcb8157ad15f4e62d0f871843f9bf4642
font_01_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 18492 bytes
SHA-256: d8549d680025aea20e5ff98b575b81a70300a9ee96cc568098b039dc47b2a1ef

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