Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb7ba603cd047ed…

MALICIOUS

PDF

89.1 KB Created: 2021-07-07 17:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c8a935aca2310f81f7655ed6e629da49 SHA-1: d88322ac011d263d9acb303fdd0b2bba7847a487 SHA-256: bcb7ba603cd047eda7bd7d0d260a1e7a11485e4656ba7f7d7f2e2e74fe0b861d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an intent to phish or distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://irlanc.ru/uplcv?utm_term=act+3+scene+3+romeo+and+juliet+quotes PDF link annotation
    • http://stylekd.ru/files/mofesonowapadonevajo.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vimemutakijimem.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4db94fb31ce3b9da9d15b83536835cd9/27923829259.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9d546ceb414ad7c083579723ab577a51/bawexiwodikosubivoju.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/p7am5epoea2tv7j5nuhtfd82kl/58516385435.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/37634140956.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/66873233756.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/kumopinezukure.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5615deb76---21561250223.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/87913321382.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e35e144a4---lesedonilajifuwodibugele.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/97516133304.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210531141432.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c413396cd---48118699249.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/fosudawari.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vp7ps0vagk69q2fi3dl7d8q8ps/95463738075.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/jpioasfe4pp6vst3gqt2a61mf5/22265336530.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088291499b07---8944595621.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61c75b1ee---bonalenofemasotuzuxara.pdfIn PDF document text
    • https://banghenails.com/upload/file/juwazimexiwenip.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/fesozut.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1baf4e7ff598ec3b462ae4299f23279d/kovazidar.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/48606644656.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52a50c3210---4141261756.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/4ada6ecc3bd794de618bc3a4cd95e8c3/40558009241.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/e71a1c490f35653c0166b4db07790a49/wumumelagikusefinov.pdfIn PDF document text
    • 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_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 11060 bytes
SHA-256: 230d0d7a103f9395233581a41a3b101094f08397033b50434472a2ee3742e2ea
font_02_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16904 bytes
SHA-256: 1bbc7a437f835ae7a1ce5d5c73b4984cb0116c8e99477d3739016830a276fd78

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