Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e9a8b8c8c7e4cc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 02:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e35dc63c95a5ff496cb394d1e53e6eeb SHA-1: 9ce84e5b7acf5eed8cd14aa0b7205b21ae70bc41 SHA-256: 41e9a8b8c8c7e4cc0d25b0e80df7b38d4c251bdf2eb0fc81a43cfc3e51fd9d24
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites and disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amirafouad.com/uploaded_files/file/zebap.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fe007d4cbbb53c8aa1b79043781a015b/tawefukasovatixijivon.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/liwefim.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/88558375096.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/nifexitevozopo.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/mijizivineguxag.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/selaralafemug.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/judedapewor.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5517bd2df---wusudi.pdfIn PDF document text
    • http://builderall.info/userfiles/file/66893247567.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/90956904182.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/separanidejulupeverog.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8cd6eb68---vepusejot.pdfIn PDF document text
    • http://snft.ro/media/file/putotovazenasiluvutilatug.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/gumikimudefata.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jasepopuxawin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d393bb28eb---pemamojegufexowejivikafe.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ac0252f2---81519083843.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/panizelaxoloxiludu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/19901092381.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/76065348202.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2ab43f8c80096615166805f9cc7e2572/noxijaki.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/godukalasobusosetowine.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/doxopujalasig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=milling+machine+lecture+notes+pdfPDF 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_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 17096 bytes
SHA-256: cb76520bc5a97040f012d0277a50db5d3bade12b29e74639ee784dfcfc7c9391
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 11160 bytes
SHA-256: 07f344698148f534e142d98316ad9aa4904906da44293c33fd02cf0fc73e2468
font_02_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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