Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f21fcec7283f2c0…

MALICIOUS

PDF

96.8 KB Created: 2021-07-24 06:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0586f7e2b01eda345c6b76331ceff3b0 SHA-1: 0d6011523ddf0b1b9afb21d9797519dc1bd930be SHA-256: 9f21fcec7283f2c09b41224b8b2502bbaac5b4c32c64dcc2a83ea52d0457c967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vpuh7ps5lrs9s7cib2pebp8ue4/91498524112.pdf In PDF document text
    • http://hongshengfish.com/uploadfiles/2021050923302438259.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cb7ea5d3---89445481747.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089876df07bb---19993927656.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d41be49f5d4981286bc5d1c34ff43970/mudida.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ufsfrf5j3itc3ts7kq42gkra45/xudedi.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/91288994664.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/tuvezakemuxanur.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3s0soi2qglfp9n9bkm73oo0jaj/gaxesisowanivex.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/xotegusebetugisafaxigaxu.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/21b664b427dccf8ca64bcda95679b159/jogoxi.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/pivolededewopipivunomibeg.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7h2o28dkd1mcnf8foeu7eu6hej/gibatesusumapagoxe.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b34d97077bc---xomuparibawizojugufosuzip.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/fevebekaludezevezo.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac10cc8a47---39383085313.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/xejosesi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/082em0d21bu7mlor60gkv5slob/tunujemapaxumipajunun.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fc0f272b5---jametezunilufev.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a7a2073b---sezugil.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/050e4bcf5566e7ca3fab71bdc692df21/77028692504.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f0fcaad8---5410146698.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4dca65eeb---79517264624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+normal+phase+and+reverse+phase+in+hplcPDF 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_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 10840 bytes
SHA-256: 8405b9357d17cf407289714809db1df6e4a0065b79744af260465bb12d11c863
font_02_sfnt_off00014532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14532 18300 bytes
SHA-256: bcdb1912f6f57800c665244064730e2d415dc4ef88f33a3bcf5e6d8f9bcc1f61

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