Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ffa215701d650f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 09:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93efc79eb52dda8648c363c4175e17db SHA-1: 81340773af9406b9283cf0a78f0bdf288bdf4b9f SHA-256: b5ffa215701d650f548cc7371657c6a675a409ff4a6a8867ed687c268f105c95
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://petikdaun.com/contents/files/80505729242.pdf
    • http://curry-box-deluxe.de/userfiles/file/radar.pdf
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/zigojiduwigezubomej.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9a1e9a99---52617509477.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/42711604409.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/putenelak.pdf
    • http://austria-ex.com/images/blog/file/pewuvubediwenedulewerugo.pdf
    • http://familie-schiecke.de/images/file/76411288135.pdf
    • https://www.retake.dk/ckfinder/userfiles/files/88210176443.pdf
    • http://nissanotogovap.net/uploads/images/files/rovijiburugomux.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161329941a22bd---lodidanegifid.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa642c3f7e---96147249454.pdf
    • http://paulabenveniste.com/UserFiles/file/sareniwaka.pdf
    • http://hopkim.vn/upload/files/60717069615.pdf
    • https://regaluxiluminacion.com/uploads/assets/file/12798619743.pdf
    • http://voijin.com/userfiles/files/rulexorosanetepeduzebaje.pdf
    • https://ciar.vn/uploads/image/files/vetosenu.pdf
    • https://mimpishio.com/contents/files/21468902064.pdf
    • https://farmaciasacoor.com/site/upload/file/11314857232.pdf
    • https://officialbacknumber.com/editor_up/49685966089.pdf
    • http://zxpgw.com/userfiles/file/vagawubagakuzu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=reduce+mobile+data+usage+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75f.bin
79c3d363c8e87e21d5f327f1f6008d9fbea4ec3a79627f1abde304cfc935b6f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 11000 bytes
font_01_sfnt_off000100a9.bin
f543610531c08f3daf75679b98713f16945f82286662b93bc35a030c85a987ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 17424 bytes
font_02_sfnt_off00012d6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 16792 bytes

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