Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce8aacfecc4c638…

MALICIOUS

PDF

95.2 KB Created: 2021-09-20 06:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b77ab1f1f32a15298a6a276e4dfbed2 SHA-1: 9d9fadf031a7c330ed4fca8bfcc5b196773ab326 SHA-256: cce8aacfecc4c638e1645235e87ec43f0eee3c8e378763c1ce6575b6c002e893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, pointing to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/56299c885411d16d44206ff867dfb3d8/25140412258.pdf In PDF document text
    • http://finchamauto.com/pics/paxuzujowuzoxadolabiraxem.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/89082216645.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/suvupanavikupemesevalab.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/9554327288.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/budefadigenidoxokodo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0f923e09f93542964de086d720b5d890/67734863413.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fefupabiluzugajudaf.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/xanazikinobasejipeginiku.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cdfa6a1cabeb009574f16b53806a949d/13382758142.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/16816599105.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/40045105477.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/fovejamekemoxizakujorojo.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/dosanapuboxafusavovaru.pdfIn PDF document text
    • https://pepsima.biz/files/file/85173798715.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/viximasa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302aeb41629---gaxopam.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/68458807917.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/nimejuwatejafobujarezer.pdfIn PDF document text
    • https://angkagenap.com/contents/files/pofitafetatenebuwuzos.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/karagirekamuxelitugi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143164ac512d---4300562905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=old+superhit+filmPDF 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_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 10500 bytes
SHA-256: 327d40bd79898d62735b15c348f98517df06b2ae972b86c221792a3775a58cbf
font_01_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 19084 bytes
SHA-256: 3af28bf61523d37e5cdad70726e079fb9614edd2000ba4c91c22b245d2542666
font_02_sfnt_off00015781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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