Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9832c0c54a7baff…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 23:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5beb2447aa57f2929bdc4f4a4aa70ff2 SHA-1: 988e6c4ce73b5d3694e2313ac94888640c973a74 SHA-256: d9832c0c54a7baff336585f8d93d50ac5d143c362f4a36fd2f468df6772c8473
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://canigrup.com/userfiles/file/89708471850.pdf In PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/29809020007.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b70befd8ceb157fa8a229c576fae656a/18873899935.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/51107886335.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nabilulatakobabinapam.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/46049674376.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/1278484789.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9ljfhv8mg552obv71lup9e5pvp/pajudatejetaloramexu.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/53275030881.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/tubogawazazow.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/bugadubokel.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/tarepupi.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/8552542065.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/62549283456.pdfIn PDF document text
    • https://partnermind.cz/images/files/78580939284.pdfIn PDF document text
    • http://dalaichau.com/files/6219216985.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/23002904672.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021090617003073499.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/54813763387.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/gozokesemuriritama.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/terowekorukikagavubedigav.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161584c8f73afa---59789557972.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/loridageb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=1+to+10+maths+tablePDF 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_off0000ae63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 16284 bytes
SHA-256: 9c7ef7a6ff81d2324879fe4a641729e7488b886b4864741d158fd2911951438d
font_02_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 10292 bytes
SHA-256: 8f172795cb1f4f2d1a5108c3c0da8e25e6e6b73bafb7b3246b3fa4e9b3c1c4e3