Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e57dee9bac102e7…

MALICIOUS

PDF

88.5 KB Created: 2021-10-17 10:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ba89a9375c91cab0117dcabeaaf60d2 SHA-1: f34236a7c9b123c831bee07d68de7c2daa135e37 SHA-256: 2e57dee9bac102e7e4b75e05ad1b1bda4c0d1fc269280a7b475a27c8af6e6b3c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common social engineering tactic for phishing or scams. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, and the overall structure points to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=locked+out+chelsea PDF link annotation
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dh7a74h3a2s3vu3h14an5bf1n5/17834056731.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/wukof.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f989bbca3f---vitugaverurizomorikujitog.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/ritejimuzepepukojovipij.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/lumadarokaxefizomisugor.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/58127272316.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/rakibalazedugasek.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/pidaz.pdfIn PDF document text
    • https://mentormedya.com/files/ninowaninelona.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/74890011822.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/10824477163.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/filusatusa.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/79887004499.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/gimaxevoxi.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109162001065201.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gijunizoduja.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/31673022004.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/rusijajajezivuvomiwumi.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/rakipoputopubo.pdfIn PDF document text
    • http://kunbot.com/upload/files/24559228928.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/244056996.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bumesudupevimatulesig.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/407be4acbf12773ca4d1cb91b3a4f87a/91418110921.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/sojikapapopun.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/51925502665.pdfIn 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://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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 10320 bytes
SHA-256: 932e8a98a433fc29e2d4877f82842a28fc0da0c60a9417cac9f63f3c459c3e82
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 18976 bytes
SHA-256: c99d103acd57f3d97e1bea30e00cb7222c702622e53556293ffe9d0aca153e34

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