Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2e8c24610d9aeb…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 08:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 129e2ec4bf0e89299acf0847280982b1 SHA-1: 8ed3b1675f427fca271733f321b4b0e10c95f366 SHA-256: 1f2e8c24610d9aeb7e8cfb6d534bf372f00b51516e47e05e2419a4e9b7c223e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a0ed961d---nojigeviwoturafe.pdf In PDF document text
    • https://cepatdaftargroup2.com/contents//files/mivuju.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/futigilemoxipuzarikajepug.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d44eeb37d77b7502ccd1d42b810125b4/ledebezafedi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160725b1ce2266---73689882076.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/vesazovudozurijezek.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f78498781366910ad5424fbd31fb9d24/zobuvasiketaduxoliw.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/855de02a09b6b7c9bf7c0abb976fdecc/97471719603.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/ludugomabujavutok.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a00548069---62668470560.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/51503af03935366d032c02c04928086c/21389326359.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2bf24344b---vatikinezusukupiwokatazu.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/13401755463.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/95744170129.pdfIn PDF document text
    • http://digifast.cz/userfiles/luduv.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9bb540129e7ed4861c94580dcec7436c/kovubinosolesesupala.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/36623869754.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/96717144055.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/38785309729.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c89892e4b29---96209263822.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/butafikapuximumomexoxar.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/68237842536.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/dowukudosozabunozeluwame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=naoh+percent+compositionPDF 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_off0000bf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF80 16524 bytes
SHA-256: e714b742a6ad077fd189133cbb756dcb82e73ddbe6d35f1be5afd7dcc02d5172
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 10568 bytes
SHA-256: 9fb00ae3f95716d354d9f1492c78aca4236ea5a4d3f67f40ef081f6b33c9c174
font_02_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1