Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf147687e2670df4…

MALICIOUS

PDF

108.8 KB Created: 2021-08-16 01:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d703acef8ec85c93b9faf576ca93d04 SHA-1: ae48efc1cfd46d75851e6347e0849d8579dab20b SHA-256: cf147687e2670df4d8aa45aa77128caa8a22a6479bf9d54b170628894628dff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vietnaminsight.biz/ckfinder/userfiles/files/69510359138.pdf In PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/lenivafaw.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25585659210.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/rubajabuteni.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/12227430866.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/13b8db5c21f000a01426be9936e28099/rekubabigejawojen.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/27939636477.pdfIn PDF document text
    • https://plasy.com/uploads/file/wawajuxexowusirejibam.pdfIn PDF document text
    • https://mszukam.pl/dat//file/gozigarulawukided.pdfIn PDF document text
    • http://kite-surf.sk/files/vizetafunelewol.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ah9re1bvnj8u7gfinrtul7trv4/51013267609.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/68413467919.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/87695950749.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fasepaloxularadonovilufa.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/30370903058.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/niladixusawuvozamalogomep.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/paguduzenitu.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/5187956415.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/99ac4bdde030314281a1f8816efb708b/46048210135.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/851b11b72d69e3cb8b6272c5d78f3d5c/sijukine.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7feb06f93bff743d0b738582294c77e3/tusulusil.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/lesakovuwaras.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094557094b28---pubitadolaxubovuj.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/af498774b15898f5c438230e54cb6d54/66545197006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=python+cookbook+4th+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_off000147bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCD 17612 bytes
SHA-256: b5b7cf2818533a802a64fd5786ef4a7649cf5973b503bedf1267c688e3f73804
font_02_sfnt_off00018d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D95 10440 bytes
SHA-256: 901d835d41011bf06f5191f9e47c599993a1dae85b32869dd3990884bef55a11