Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5d8dbfaa789dc1…

MALICIOUS

PDF

88.3 KB Created: 2021-07-06 02:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: da848f7ee3f9c9638810dcf934d0e393 SHA-1: 800ea7938691e338ccfc6c7488073900ff4cb724 SHA-256: 2b5d8dbfaa789dc125c7a09ec7572a10933fae56f333efe61c8a6328697f5040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

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 http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884010ea165---4692306835.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/508f7b5caf6a0b2390546ad54162082d/sivemanixadunowasiw.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/870da0e80a12484233f4db482cbd0d12/7377170957.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/36305929928.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884d7b5d868---futikutodel.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/16936718822.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/gijuzemaxuguvuxelenaveten.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/87579808608.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb92e2af2b---jateputofigag.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/0eb2e42ecd5c31ffba59f0d35b189e45/juvabepuxaxap.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3d86ff2d047bf2e6e4decad937a81618/77280473744.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/29930071756.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/21241864402.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kadizudozoluborovi.pdfIn PDF document text
    • http://atomleasing.ru/media/File/63758942119.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34ba190d9---2751798702.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37f84b7e6---97014702942.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/5302395743.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073db5953922---xerowinasovorifadugaripu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4h9lru9o27s230fteg33v9i3oq/47022407322.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d0d9531f36d72cb2a9558c0580a6e10b/62616006551.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a615c42c6d---14974543310.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/449783a190413efb670268b72d44fdca/9666949658.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4813dd1cc---25077084625.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f2886e17c6b33ba025c76b756be4846/19110717678.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/15021761978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ministry+of+education+bauchiPDF 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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 18004 bytes
SHA-256: 6018aee21cd4b79886b8a07a9977cab639b377cd3384cfd9c705ea0e7d2aa2cb
font_02_sfnt_off00013acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACC 10876 bytes
SHA-256: 9a01bd718af59a37ab3afbda9aa799f679b8ef388393f088f9dc33fc6366ee16