Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d13180926a36312…

MALICIOUS

PDF

80.8 KB Created: 2021-05-22 03:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 966a6af64576f0697389af16be6542ea SHA-1: 379bccc09f8183b8641a457cd43e261f88e5f48e SHA-256: 9d13180926a363122b876f300d04d48dc98c1052319d7c460efd9432547c1a21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of 'utm_term' in one URL suggests tracking for a campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://infrive.ru/uplcv?utm_term=sd+maid+pro+apk+2021 PDF link annotation
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/71482451002.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4143276b365df5e1364517b65954bf0b/sivazadavejeguweji.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jakulezoro.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/17677026293.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160940801c1559---sevarajatatulivezigoga.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/zagamuzewobugu.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/lajisusumosos.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2ca6ed55---726498811.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ed0fce4a14b191ffdfcc2172940866ef/xuziditimakenazodo.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/divaxawopevukekufugu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760e96befbe---79546178757.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded712df27---muxagosekonigomazo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/93072738ae007703a0c811f92279550e/wafubexubajer.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lifivapopif.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ee6d5a53e6222d0750b43400b33e60cf/8828140316.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k3leia5tii93e4ke4mpc4463h0/vegarivubenireror.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/261c4c4e26eb34920293f38719260f34/51321576805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 5388 bytes
SHA-256: df46d7814f51c2863bbc0b81123ce2a7386056a4570a12c2f3e6abd7e3435ed1
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 2236 bytes
SHA-256: 6b2d3c5f6256688f626d058edaec36c164b6f3560f9078c09021343a121ddc15
font_02_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 10636 bytes
SHA-256: 296f84a1276b0263a6786df077c420e0c89d665d2d978e1946103a0a05ad3872
font_03_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 16672 bytes
SHA-256: a26a6f6f3df2c07d1e971bcaff94607f73a47ac852c1530dfcb1043d1b740844

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