Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df61a2e532e07ff…

MALICIOUS

PDF

89.3 KB Created: 2021-09-02 17:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b21b8522d666b189ba12e7466479400 SHA-1: 4fb44fd03476e398c535a596f414ec627f154d14 SHA-256: 4df61a2e532e07ff32ec85047252439fc6da825e23df6564b46505a40f6858c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c086c7df602---fisovepetomiwizan.pdf In PDF document text
    • http://halongbaycruises.org/upload/files/11899192598.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e555c637---48770036639.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-24/20210724060013309619.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4120beff---fuxuso.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162425096868687225728.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9ba3cdbeb---48121641817.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/banapeza.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d1743cae3d25ef0d8a286b0b7c99cdfd/somarivipofixeniri.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607afeb7a8c19---bofexizarefixelurime.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1f0877e0---jibotagav.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607db085008e8---poxivomuvit.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xinejefuwafove.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/wivejoxezuzijimevijotav.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609474a23af80---44631717083.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bffccafb7bf9233cf5ea2b756840352e/gotalobomomazijibure.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/16904820678.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/juxatofix.pdfIn PDF document text
    • https://argumentua.com/i/file/7531975206.pdfIn PDF document text
    • https://rentcar888.com/uploads//files/202108091242448889.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/69638022618.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/58197169869.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021081619155073499.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086553a9905c---13507394060.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/vudedipinatukabebapuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=radheshyam+ramayan+pdfPDF 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_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 20196 bytes
SHA-256: 4623322c73b62a62ca9dcb6e6ccafffa6fb15d3fc8c8957b2c2edf4cf4b5f234
font_01_sfnt_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001401e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401E 10568 bytes
SHA-256: 0069e8c0ecd13a653979d0705ed4c3272522cd5e43e40122d3aede420601b95b

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