Malicious PDF — malware analysis report

Static analysis result for SHA-256 757fbc570b59cd45…

MALICIOUS

PDF

91.6 KB Created: 2021-08-01 01:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b676496dd457a1fef7bb81a58c993d23 SHA-1: da5fa1420b98e8dd8ccaaa497e407bfa41e0f4e7 SHA-256: 757fbc570b59cd45a646a9d36814c94a78ff86f36c9a0177729bf888de147cd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs clearly show a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0749c496c---bituduwepabadexovelokur.pdf In PDF document text
    • http://thongthien.vn/upload/files/belesudebibebeket.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3e53b323abefedaf0cdf3ebc7ed4186/78014817907.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/25995740549.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/ninixevub.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/60165975400.pdfIn PDF document text
    • http://airsoft1.ro/files/file/redugugoxife.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/begupuwus.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/napipuwufob.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/556aeb86c6165d9286e3e4d9a969ee9a/53089173072.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/73054984525.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rpnou5c8ob4jcu9h5ig2r66rj2/wuvokufotujabukolulofiw.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d581b17f80d---gupujezufuwekotovub.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/92697fc7ba5dbab23d7c0dd4cf209e84/vipopejakedaxataxavorizaw.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/61lpo8ldfr49rd3vc0s2l4ed35/19886580460.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b5vsf70dguoqjic9jj0rc3gnn6/puposorefo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d21f13423---narosimakifedagerix.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbea21b218c---43166953167.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5cea122b00268ecde6784cadd9f9d05d/60745403687.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/riladaxubonajaxiferugen.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/31126631049.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/sopelarip.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1615589c7a---texerulapizivekipa.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/2869045749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=summary+writing+exercises+with+answers+pdf+igcsePDF 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_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 11376 bytes
SHA-256: 311881a10ea187b5f20428047860e845e424bda1060ff2657e0450291c64e1df
font_01_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16732 bytes
SHA-256: bf3a1213b62f38b8c75e39779286d6ce55af29e80554b3e3d1d92e4d42136c68
font_02_sfnt_off000146e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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