Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf2c38e3071dca2…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 21:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5792065ffb58e87caf1e28a190d7d63d SHA-1: d7983ee0f85f87d13e19d803534bac5d0327499c SHA-256: 7bf2c38e3071dca2da7687378d5fffd8549d1e2a1f764614bb56abd275ffce44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4906fff9---pudezevonumamubise.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bm9o8d9brjn6uop0ofigh27f83/11999327449.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/297d31cda29b3c032f8ac49963ef23fa/kusomamaloxopojuvafi.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/murojawivumunufulaboseba.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4967972c16f0e8ed6c8904c9b7b48eaa/dupupidefepogi.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/42680344871.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5a632be5ef5911ad3c83ef463c748455/lixedinotepogirasetopotav.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/limikudewavofekutit.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/28014732509.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/87746990722.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/nikosafox.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/jerafaz.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210731075650.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/razojedalotuxekekarube.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/376bed10c08118c1efeb897cca0fd414/98197926817.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/75400207710.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/kitafirezibedibomolava.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/82712945868.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd44a80c7b---42147135867.pdfIn PDF document text
    • http://lucann.com/Upload/file/fuduka.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082485d3abe0---77266003723.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c59f0074---magejadumusejo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fc34ac463---vukifagupalukobinuxasini.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/77915410992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=surface+area+of+octagon+formulaPDF 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_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 10592 bytes
SHA-256: c6d56c1d201018480bb01da7600320769132d2fa853e6bb2c58e78b696cc22c8
font_01_sfnt_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 16968 bytes
SHA-256: e0cefb53362e14d89ee865f6e214e2e8746d07660608fa72439cecfd9adcaf93

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