Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ff32ae8a38c69a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 21:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d27107cd1eefefef3a272cde83982bf SHA-1: 679fbbdb7841664af0043894a7e27c01673a434e SHA-256: 56ff32ae8a38c69a32aee2362835b7bf8a1cde5d38a53873145835446a2214fe
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ebc26cffeb27246f888cf90d62cce329/bilawivelakobi.pdf In PDF document text
    • http://4reality.cz/userfiles/files/dugitafafefoz.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609abca19b550---rifubidegotozedek.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/75354827380.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/22698014124.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5ee6bed5d---wijuterezelisajozox.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a79cd0a58---56638074173.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607137cce8277---jizobetekuxezudakusil.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pafedexeluvor.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098922852c51---dozuwabenugivakipe.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tukubipaf.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbae5569079---wadadujanaja.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/41890235400.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/5b6727dc9dd782a2373ce765d8b2b566/85648541686.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210608141714.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/magusesed.pdfIn PDF document text
    • http://charivne.info/images/file/fijavabotejuzomanoje.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b1064a40---botoxotelilololanela.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/givikur.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766b2eaf3d5---doriditazalixaw.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/naniseniwuwi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/403c65f9068422f2222243e71b6dc658/dexanilajeta.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/91ea206d2e888c30dd396c92671cb675/35874751319.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/tagonodivepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ncert+solutions+for+class+8+chapter+18+sciencePDF 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_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 17148 bytes
SHA-256: ddc486531340c4a435a764405ece6a8d876433f4de99df078890a7fc7b299c05
font_02_sfnt_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 10912 bytes
SHA-256: acf7c7560f83f929e214ce5a83f8de7babc27dbea2a38a281b6e8f15c3a7edc1