Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3c188c95378a74…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 18:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ae1e6dc5018ca24cd4e599699b00f32 SHA-1: 7822af448e510f38f504725b159da7b740232a56 SHA-256: ac3c188c95378a74957e173e466159ea0b3cb84b9c500c9b6ed4779dd1e64a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and compromised uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://congluc.com/upload/files/goronotisel.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hpigv6dr873ig1jb80ip3q4r72/99840709130.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/xipozodelobixo.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/tumuvomag.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/mirapojofeda.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/21770361090.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f527bf7b---vexakegejigav.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/tekitujijegudaduji.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/47498041877.pdfIn PDF document text
    • http://kalikraft.com/images/file/bazomobomezakigom.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/79930296271.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/titusotowobelatafo.pdfIn PDF document text
    • http://skncn.com/u/files/vipugititifubabopejuvub.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/pobepuvibuzafotuvojolu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d950151733---37698377869.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/siwofilukotufelubak.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14484499246.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b16edef6a---nalugaduxogukilo.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/73514494390.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/75117866207.pdfIn PDF document text
    • http://a-pluset.com/userfiles/95470402848.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/setikobavodavixoreb.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/50354063545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=one+piece+ppsspp+highly+compressedPDF 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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 18100 bytes
SHA-256: 1168309607be33208b08d98a55d61f9b7fa9b5d5a5fae6ef627f4b847891dbac
font_02_sfnt_off000135f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 10840 bytes
SHA-256: 3e7308cf3f804e6bdfeaf30f8c2ee60f674291572c23f3c5bd0ff6549015cd6e

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