Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d9ba37c06c1deb…

MALICIOUS

PDF

111.0 KB Created: 2021-09-05 23:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3a91f3a9a158aeee9188e2d5dc4d148 SHA-1: 1d0aff2152633e685741675214ab115ac266568d SHA-256: b5d9ba37c06c1deb150f0e2a4dfa6fdf526574e4952321fc9bfd4a8b549d62f8
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs and PDF link farm heuristics suggest the document is designed to redirect users to external, potentially malicious websites. The presence of multiple compromised CMS upload links further supports this, indicating a pattern of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=aristotelian+syllogism+pdf PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d51f361ec9f7d8302ffdd7286f270563/40297458914.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/gowovetijuburowup.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/jaramaregabetonemolor.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/58542857540.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/37812052455.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/65861785403.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/46067304893.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/lipabetasovujepirabi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8fd1c6cbc---88195473687.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/6695349824.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8bb8a14192d6defa6823a61515fb058c/pijozujuxuguluwimesu.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gopefuzasepapazapotoku.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210903234607.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/juzava.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/84455837073.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d1eb9531---79153134039.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5f79d8e665fe55a88dec810750887a21/bajoxi.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/pubugeg.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kowavafabuto.pdfIn PDF document text
    • http://mosjob.ru/images/file/88235015729.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F76 10936 bytes
SHA-256: 897794b507e2d48f4c75e059148357835168c6f9ef16233768b93be5dace2109
font_01_sfnt_off0001589c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589C 20056 bytes
SHA-256: bd72128a2b38b4c8f8e2fce7dacb230e5c1618b7ef98168186175bcf2c4565af
font_02_sfnt_off00018d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A515 1872 bytes
SHA-256: 79be395588af96fa5df472893822587051e439780fb3f760348c77be68f22830

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