Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd547139d6f906b…

MALICIOUS

PDF

160.7 KB Created: 2021-07-23 07:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 510517cd705dcd1ef0913e045bab847e SHA-1: f6cd51bb88828686d29ce80f526fbe0bbab39083 SHA-256: cfd547139d6f906bd3c136429ea66be526ddd136a9019b6fbd1303fd69b612a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to these sites. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://delphin-restaurant.com/ckfinder/upload/files/tizamotupovejapebulosize.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f22bbc479a761285af3f1c7c4120f876/16952903377.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/nogamabegora.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rgqfncdn34a4ulnpn7j0glhbbs/2370949220.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853a99107b5---27893701233.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e214020dcbc---zonekituginamade.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/36357137106.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/54002897083.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060820142873499.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160781f3adc5a3---70846771961.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/754797158.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18c5183ce---6826279085.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/tabasajudaroxetus.pdfIn PDF document text
    • https://sambelteri.com/contents//files/12102042681.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/4052353940.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97ca421d8---14028429994.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/51578427409.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f3524d1382273f38107594f7bafdcc12/94044472618.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/96838862502.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609737ce89ba9---widolowoxenagokote.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l13ksacnagr4tepvo3rdknm83n/rugit.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e45c5a9b---33439486492.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fufiwisebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=signs+of+social+anxietyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F27D 10704 bytes
SHA-256: 0c7ddbaec7e5a8efd5985e29051ef030fec4e03fa523d2ab83df108717e51b40
font_01_sfnt_off00020b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2234A 7932 bytes
SHA-256: 721fe68de8de757cc38a376815ab4a30be5244a2c5fa8abbe3c2168d846ac9b6
font_03_sfnt_off00023d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D84 21592 bytes
SHA-256: c82488203f82ff53562db8371111e73c9fa841d67fc746cfd636b660647f2354

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