Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedd8b644aca39e4…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 05:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f2afd09d1816a966024fe935704f2321 SHA-1: 552a7732b48d8f26662678a45c0613b99f5b9458 SHA-256: aedd8b644aca39e43d23debd5852e0d4731116e4a6cc20a8c5b1826c8d0c8538
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=robux+card+redeem PDF link annotation
    • https://vespaclubcagliari.com/userfiles/file/88058737765.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/25857922705.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/49503872403.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/70859743044.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dec4c4d5804626c5a95b2daea7676b51/rujolivusofupiruzaxig.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/94620070769.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/5084868644.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/mitedibugobofaluno.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/xufuletenulise.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/12154578984.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fufazuvuvorogeji.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/940677366a5c5db0a60a2844bef716a4/16060290725.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/jemuvevavonubo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161563f7a29d1f---84474215730.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/44172290357.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210914_3B3A39C5D9138DEE.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917205806972.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/12971726375.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/fikavesanakutolelakokoxes.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/vuzudimotin.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/zusirozalesajerib.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7724a3c90---48691449672.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/38103456804.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109191448197423.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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 17140 bytes
SHA-256: 324c27cd686ea9fe5c8647e2db6b8c09682cce1244e04bac06a09f5e0f9c7db6
font_02_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 10408 bytes
SHA-256: 689decdf4b7398eac27f9b7cbe24a11a821875b9b77de5f8f7dc520c446cc67c

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