Malicious PDF — malware analysis report

Static analysis result for SHA-256 162f7c6cc16a8f34…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 19:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7055a50f4f5a00aa880d760068494e86 SHA-1: 85dbb8da2f1bb76d639ac426503e444a380e1ea0 SHA-256: 162f7c6cc16a8f343f3faa67a097728ab520041dfcdd64abfa5927c95772ecd1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially malicious PDF files hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161434f6282cfb---18533353028.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135c8e0d1dd7---dofexe.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/97664541805.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wukogakewu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0381de97e---jugiriguzuwivevajifikoxo.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/mopesedasibev.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380ba406624---34455463600.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/24b1553c243c8c03344ac32938146bc3/409170104.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd70d84309---3979398646.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/widagamaminog.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/76407543365.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/26047321657.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/84387714181.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/segediko.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/88720846966.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/xaxix.pdfIn PDF document text
    • https://icbacademy.com/upload/files/19546210820.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/95351925632.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/81510610194.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/57168287968.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/paxux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+comprehensive+textbook+on+nursing+management+pdfPDF 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 11500 bytes
SHA-256: b0fa9f9fcddaad175e0336dc2ea63d87af449b2456c395c9c8f7c3ebc3fa5a49
font_02_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 16588 bytes
SHA-256: 37789a4c08e509b8184c6e5221a620280fa48bbd051a6cd34673f08c58c348b2

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