Malicious PDF — malware analysis report

Static analysis result for SHA-256 c288a23862b11b74…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 12:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14287a1a9cf21d6a5e6e38ceb9ae8969 SHA-1: b5031a89681bfe842847eb3f413eb92027093720 SHA-256: c288a23862b11b7470887dff5fd11557641242075d6db3cb0953723cc8f425b6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, and contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/45744e9fd14930e95713f596e744991b/fidevafuxuju.pdf In PDF document text
    • http://mitcostruttori.it/userfiles/files/65903721180.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/28198226410.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/91146165373.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e05f300191b028462ef224b14f1d8aa5/41376326615.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f6eb1b8da8d---70962733170.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/zoxozupimaju.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5d56d9df2827954248101d0bd1ed5030/98769692668.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160af46feed39e---detotudurasafutimi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b58a72fb06d76b8a19e36d8f434bffa3/53552706987.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/23275182171.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/80478974034.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7ffd6dbec---labejezudurafegeme.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4df2c0ad91---jegukugifa.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/13981223416.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v0hlvnqv4e675cn1ih4voo5a6f/rixosiket.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/93144818783.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d865afc2d6a---pisipowutoxusukatas.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/2050724226.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/gokufavotazomofarofijaleb.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b27138e292852b59b86f2cf17303932d/jovipunuwepijubexezex.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/96422509554.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/guvipopuxivawawowoguko.pdfIn PDF document text
    • http://jinyezi.cn/upload/xizida.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/65618130314.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/efb6c96d624d2c39d42ac259eec7a5c0/59162321414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=influvac+tetra+2018%2F19+beipackzettel+pdfPDF 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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 14264 bytes
SHA-256: 2976537279e21511c836047a992bbbd345563469a1e08fa9294c3f110bc9c05a
font_01_sfnt_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 11436 bytes
SHA-256: c03628511635add2c3610d5512f2e8485480e79151b60643e26071f3b691eb7b
font_02_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1