Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c96bcbe47e7530…

MALICIOUS

PDF

87.0 KB Created: 2021-07-08 05:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a5e23a7b94b52a23e3cc9a5304ad1d7 SHA-1: 217afa254e2fc839304c5aa05b67b6f1e1b88e65 SHA-256: b2c96bcbe47e75309ebf6e1f3e60f02f2b84d386cf26229904179d16d4c14821
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to domains that are either compromised (e.g., WordPress sites with vulnerable plugins) or appear to be disposable hosting. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://lysfyyy.com/upload/files/pevarugudo.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc4bc1fc4---kerepajidemoxuwivexezej.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/vopipaxezidi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c14e1cda3---sobilevokugapusog.pdfIn PDF document text
    • http://nenorm.com/files/files/tazasibid.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb4686c97---85073784519.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/14458526696.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f3033877---74186379170.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc50c3cd82f452d88c45594af04b472f/155443118.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/rusuw.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/92bbf80aaa745b08b8d4f59073e8e4f3/49574195431.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/174eqej071oust7gmkfvk2mjo0/tedipuzifarujizonixivufi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//xoxadoziguduvipepigi.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bdjqg4g8n2680d809s5fsqv4qd/kiwodix.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/97f6990af6a1da91e2ed532b61d4b591/17969147836.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/93858373825.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/febigutubanudavogilujimuj.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b2ce237fd2721d1f35f876922f502176/zopitibigevoxipewad.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a0c13b557825aa69bb563bacb61e4b59/xezoj.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/8472282842.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/727eaa7fa9697443a6e35153e05fbf2c/wezivuperobanobab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=people+of+des+moinesPDF 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_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 18424 bytes
SHA-256: 3507329a0834651b507ca2ae4f0c8d279ec1ce3b1836ea93c1a8dec20862b5cd
font_02_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 10300 bytes
SHA-256: 96200112ddf43a2b481aad3c9379a7a4109b81b37bb12a4ef0d0f7811b434267

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