Malicious PDF — malware analysis report

Static analysis result for SHA-256 786eea51bbbc48a5…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 18:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b799efed084d5e92db25f0fbf6f5abf SHA-1: ce0d1cc8831861c10fdb9f33d57fdca089d8e102 SHA-256: 786eea51bbbc48a55d87b0f45ec4ccbac8799c0f293410e0aecb6719fd2c5fa1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links. The heuristic 'PDF_IMAGE_LURE' indicates a screenshot is used to hide a clickable action. Numerous URLs are present, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 2 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 https://krisoc.ru/uplcv?utm_term=how+many+ml+in+small+glass+of+wine PDF link annotation
    • http://zespolbahamas.pl/zdjecia/file/17071541402.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/94456039941.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adcbe4df48---45437376958.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/48400875780.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462fca5b4d6---zivutebiti.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/xudedizazawon.pdfIn PDF document text
    • https://aashianarealty.com/file/55243533645.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/26558445334.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/nepawozipesuloran.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/28577689306.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xurarirojelisuk.pdfIn PDF document text
    • http://klenderbio.com/upload/files/dobatisufubes.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16150d8e1c033b---libimugisixolomav.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/94345536757.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d1c9606cbdfbdb603cae191f98299d80/vumekopezefawuku.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/69703335481.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/44318697475.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jixitofabumu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/97300994794.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/85978660826.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/bofafowatuvakomubememimiz.pdfIn PDF document text
    • http://huntland.hu/upload/file/gabidezojapavawifow.pdfIn PDF document text
    • https://suksesunited.com/contents/files/fewazurakuzikofotuwovov.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/68915103518.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/mevatanetomojonefenuxebos.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_off0000af05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF05 14408 bytes
SHA-256: f5a2ca8b35296d4e389b037f13713b0927979d079cf1b44a82a1e4ee5afc76a5
font_01_sfnt_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 10548 bytes
SHA-256: bbaa84f515e5bf9e222b1e7ffd88669a7e0084735f5d189f6da26da3603d27b2
font_02_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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