Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e7db4f39bcbc1c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 11:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 219ef05e77e859b1bbf423fdab380893 SHA-1: 7f82840380526e87e971a59721466a1d5f983695 SHA-256: 48e7db4f39bcbc1c2546e3168a7a3f5f423f78bc07f49622dbb17ed657cef88d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains. This behavior is characteristic of a link farm designed to lure users to malicious sites, likely for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amd-export.com/site/upload/file/86876908435.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a219658e98d---85247737145.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/7439095446.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eeeb2e5b2---xozuz.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/nabuku.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/94263805484.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/39357337581.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077fba0d9875---47223642504.pdfIn PDF document text
    • http://15889163.com/ckupload/files/rafawa.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/legulajopanajoro.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071204f33352---58372849213.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/34027126461.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/xajikebadogigudatep.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/95701097278.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/hvtmcic1f28hn1ajlma7n3d4l0/28830810816.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/mivupimifide.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vch0vepfd2m1ljiinn00ujejcc/71836053496.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/27323765081.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/53969615936.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/64722934311.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/99047990673.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/87942543210.pdfIn PDF document text
    • https://fultoys.com/userfiles/34652168789.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608523eb4b74a---tiwuboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=finding+the+gradient+of+a+line+from+2+points+worksheetPDF 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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 18900 bytes
SHA-256: 311dc930040553719182f97af999918f5e3be84507cefc1c23261d9133376a5c
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 11220 bytes
SHA-256: e17642f7a344f51c00477389b272ed68b3e8f8413a1a56a8d810fd178de5a929

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