Malicious PDF — malware analysis report

Static analysis result for SHA-256 579cf4081555c387…

MALICIOUS

PDF

68.6 KB Created: 2021-09-13 03:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c56038a02af65f990c1642643548c5dd SHA-1: a687127ab737439ac6d75723c2dbcb31598ac308 SHA-256: 579cf4081555c387e48bee849b5c484198ac3e9e6d0242446de4d321f794cc70
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure, being image-heavy with minimal text, further supports its use as a visual lure to trick users into clicking on embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://orkoien.com/userfiles/files/24332511354.pdf In PDF document text
    • https://producto.works/userfiles/file/wisis.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///kugujifidopibiwov.pdfIn PDF document text
    • http://snft.ro/media/file/suwavonejad.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395c5307bd4---bufemizobe.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/sosejenomewarosepi.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/43281482858.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/80897829235.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c1f6f79860c8fbeaebe21bd229cdbaab/75890895847.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0398b1375---91745741372.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/85479033282.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/19450788809.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/87286241698.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e12d44bb6f---nakirafanogavapegegaxezux.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/bamesegi.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/wutadikinejibiziw.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lapexon.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/98289684970.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/93310067966.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/60239324763.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/vutuvagugisoke.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/janoxefetunuzozem.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/19856765178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=top+twitter+app+for+androidPDF 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_off0000b0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EE 13968 bytes
SHA-256: ba3a2183ab9462898917a6ed63cf16d4b93976673b8db9a38d876987a0edf75e
font_01_sfnt_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 10328 bytes
SHA-256: f53362c28d2ce5200f0f9a8f46263c8b2e915ce011cb4b0f5d431493e730c412

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