Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e6553bc55cdd80…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 01:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0e0afe99fc40fac0e33091402cf0355e SHA-1: 7fb3a746838d5269c295a19cf00eb0c2d4690fc4 SHA-256: 91e6553bc55cdd8005bdff808a1f83d2fe1840a64cf923fe17c141f3ed703f83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://catamma.ru/uplcv?utm_term=catalogo+yves+rocher+campa%C3%B1a+13+2018+pdf PDF link annotation
    • https://hasekei.jp/userfiles/file/18285525253.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/lasijidur.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/44380372427.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f221f2ed---22111213600.pdfIn PDF document text
    • https://senhewood.com/d/files/sisitonisuge.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/68810992147.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f166951d26db332e729f43f78cfc9fc0/xepeminutuku.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/37067763030.pdfIn PDF document text
    • https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d994172521---pogil.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/81197269982.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/13168247011.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace460eea42---pinofiwamubujalijexelor.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/47689082962.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/51644161375.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160841a13ae3a8---dopoxajumi.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/wuvoruwag.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772aad2c89f---sozegovoweroxarete.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d4a49036126f4d5149fb7603a7a63482/59294733820.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd1c4e74f---jimatimoraxulatag.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/84322018104.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/556006317.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/lolinuzufipezavejidejopok.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/99964178596.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_off0000c5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 20004 bytes
SHA-256: 4a922c0695073084271d49423570afa947e66bcca3f01e5e31f52f3b4d108d16
font_02_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 11960 bytes
SHA-256: cc2555da80f3748ed4b414b4f651fcaf6398c4d4da01c76302638ae0a993ab05