Malicious PDF — malware analysis report

Static analysis result for SHA-256 01813d367952f2b3…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 16:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ca5bad65eafb55608853f77cd0c69fe SHA-1: b45691deacd47fd768df6f19d0326b827ff3a82d SHA-256: 01813d367952f2b32252f29a3fc560910eda9bffc2e133a0d8936c4a83c6b51c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=amino+acid+is+to+protein+as+dna+is+to+rna PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/7f8795fa6711b62278982d58e659ee02/zevubelilizajofe.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bd566dfecba6666ab53a2eaa39802a0c/6775519292.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/zasudovatuwo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/15481786807.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/66288053561.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xogewulutusegasemaxit.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9790c9b967---befitu.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/80074046769.pdfIn PDF document text
    • http://onboardviaggi.it/themes/userfiles//files/tufanofikisekik.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/moviduxuvoboxugibavu.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/64513738466.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b48c87f22d8---terarisuzuxibafalor.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7bef80bfe---zazibimegig.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081de75c0062---19985454479.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/xubazor.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/79774649137.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074350474b33---pojifezudajopukekaxi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb37e6fb06---vilexaxagonutijam.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/77345259310.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/10113227566.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccc3ae587---fuwoxerof.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a0p6k2oer8bjcpnb5olu0981oh/fenuputojobupafinow.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4094ecf0cc---73693337313.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea11bb4326---8024938517.pdfIn PDF document text
    • http://446888.top/userfiles/file/24502024376.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/kbnvdmmmn9r7u54m1leeeualo5/putegokulufosojiwowelo.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_off0000c007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC007 10608 bytes
SHA-256: 4fcb16499a53a085086491ffd91a4c4cb02f2d3dec11cbad7dfc596bda7715e9
font_01_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16176 bytes
SHA-256: 8fec040abfbd055cba38cecb4e7db37cab34a4822714388f934013ef85476d74

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