Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2ee0d1986849b6…

MALICIOUS

PDF

83.8 KB Created: 2021-07-13 09:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a777f29cd4ca0b819588b6afe2a08f4b SHA-1: cdee37a9b30515e0f497a4adb935e2b6f3c63907 SHA-256: 3b2ee0d1986849b6341eec561094f93a6af43de99230aeb9ac224db509d52dce
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress installations and disposable hosting, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ebbgps2q4tjbd3ae9oshh1uln2/pufuberosi.pdf In PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/80846023646.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/avpba52haf6c7t7jbspm6vs962/jexaboxusojevovon.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dujonorikefozakukexeki.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099adee30c0b---33814822050.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2kdl0b2oesmahfkm7ab37pl25e/18796095314.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a0e88fbb7---wifutenov.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/taxesalexututifabe.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/75824134168.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/jotamubuluviludob.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1a4f5ec8509cc4ed6108b315917cb9f2/sudikugiw.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094c63f4e846---befutupu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/7461761a3b1094650ae42c348ed669b6/luwizesofa.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/45a7b39668a313f62d293e9c129bcb9d/27243567769.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d5cbf1d2---gapepofigawejewanatopul.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/48502382186.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/83fff08cfb8ff9ee01ce88ec5eea74df/75169120794.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c1a4b1d76---23261667859.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/gubawamapafulolokilono.pdfIn PDF document text
    • http://allycatering.com/userfiles/76294754708.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/diwavusozuvez.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e5dde388---pusoduzijozotizokabuvo.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/kuboriwanobebironid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=compare+and+contrast+the+medical+and+social+models+of+disability+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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 16548 bytes
SHA-256: 93bb93b4b6d25b739ae837a323b3b18fbc7593da18dc4ce43a437b9990815bdc
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 11172 bytes
SHA-256: 850075cd1c7726d34dfee373f4757bdd39470f12462451460900519fefb99d96
font_02_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1