Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb6152f6d80022e…

MALICIOUS

PDF

94.2 KB Created: 2021-06-25 07:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f63efe7a52620ac273fd6919f8ef7614 SHA-1: 56a302cfd186e6560e4738bb3986d9cc3bad37d8 SHA-256: ddb6152f6d80022ee414ada53b411777832f2d979896fe261f4fd9401df3552e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golden-candies.ru/webroot/files/files/11516802926.pdf In PDF document text
    • https://communeouchamps.fr/userfiles/file/48064105053.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ff437ebbb9b31ccb38bb117e046e749e/87562363880.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7d06656d88ade829f7903b11b3baf5a9/23913627862.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jdn1p490fheqs6b4kdvhvm7sa3/gesugigemuwub.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/fuligixigatodovilikan.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a935e2b4---73841225804.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/31015466418.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9fa826e05108549d5c38e95de74de9ab/63806519386.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/85699126888.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2nm7ouifspsfuce91esb2jder0/zafezomejajuvifi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/76def6993a7a9ffb31407ab5ac3c7584/lalamobusaje.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/44376683096.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/euv17rjcfu007678cc2dmvpvv8/18602787639.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/7464617541.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/7b52718399d2e14659eff52cbebc41c2/kizitozutiluvipumes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fat+comparative+and+superlativePDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 5232 bytes
SHA-256: 586bec5b77b26ad70aa4d3ddcd62129c142e21bde70e194adb2166d374f668de
font_02_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 10868 bytes
SHA-256: 5e2d4e6282afd65b84bf00aca32120ff3057f7e8ffb59a18e33ef2d37f6a387e
font_03_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 12660 bytes
SHA-256: 045a915807d79763b2060b03434f160a387abebdc966300e519e8f792fa4ae84
font_04_sfnt_off00014c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C08 16256 bytes
SHA-256: 0c28d55d9957e5be45f9d3302843a1d8772fc4e8a9a81ea04eed1b5cc2016f23
font_05_sfnt_off00016165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16165 1740 bytes
SHA-256: 0fa38b11e28a8990e1b947714e894fba9dc87d533679748745bc540cfc52814c

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