Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d57382ee279218e…

MALICIOUS

PDF

92.1 KB Created: 2021-06-25 21:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb924859fd3d79aee169632c37fc3af5 SHA-1: cbe4992991dcedf4a37a038cdebf3bd0e529dd61 SHA-256: 8d57382ee279218e6ad49aff5e245f087ebc639bcb1747ffa15e801d8f579884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to direct users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://barudan.hk/UploadFile/file/20210607042648305.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f4acc1c89---mufipoloxofapokoboj.pdf
    • http://envigest.cz/upload/file/45030300300.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3904a9c3fe7474c4f39b76c673a765cc/93405596474.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52fe8f2956---zigomi.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808889cc1d7---fepoguverusejatowet.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc507eec7---94122115209.pdf
    • http://collegium-connect.nl/ckupload/files/zabodobonurikasagunepomiv.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c230f6ec43---nonugurilup.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a606f66aff6---2801214856.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b999ac3ab---tofilopetufete.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962743bda4a---nagedoruxibifupobinuriza.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/952c1482601b0c8301da087469d712cf/90881752150.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0551d5c580a5790c95b616ab0516012b/zesijevomajawefamonigalak.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609102ebd54b6---68755639114.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/wesugofiputababuwadeviveb.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0954ac818---fitimokobisi.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/u3om9vjcud7fsh0c9640fo0jbe/lodavi.pdf
    • https://dianthusindustrial.com/resimler/files/7966291843.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608353ac584db---85564222788.pdf
    • http://ttworld.hu/uploads/content_files/files/vesovobafotexojezobaviwuv.pdf
    • http://usaoxin.com/userfiles/2021-5/file/35236702760.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e46b1950bc9ea40400c1ba1fe74faa97/33726003142.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lauryn+hill+and+whitney+houston
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023b.bin
cd80384c467481dc359f6829c46e8ac73616624e3c59e57c18b7db7ff628c649
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 19316 bytes
font_01_sfnt_off00013378.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 16792 bytes
font_02_sfnt_off00014b8f.bin
e5d68344294f432a17b509ef910c8663e855ccc5c4a941f73c2ab2d7f26feb57
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8F 10600 bytes