Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3c3643e6171f21…

MALICIOUS

PDF

83.5 KB Created: 2021-08-29 12:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bf1cef756b66102a1a31d75c611ea915 SHA-1: 6691dbbd624ddf715fabcd33cdad0caf6858650a SHA-256: 5a3c3643e6171f211da2d8556a8807e18a9f09ad71a8158865ec3ecd0467d26a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://dharmapremipariwar.org/userfiles/file/togaxegemevelitiser.pdf In PDF document text
    • https://jahanchart.ir/data/files/file/4965315332.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098536ca261f---lufijinidenojewililogo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/18994241077.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8057cc707fba35e847d5b3fe6f479845/nugiz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9c652236---2104162306.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f60f0c58---mijuvanefakusumid.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160868843c5a0f---walaripawivir.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/wuvixavenivigejeruzeb.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/38514391887.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/86943028114.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/32821905681.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/tanapafupisokafedemedur.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/39410862577.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/12270325451.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608456c7c8a0f---10741231713.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a8ee511bb---fedawuvese.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wiwasawopawodezaxige.pdfIn PDF document text
    • http://veivel.com/userfiles/file/turanevo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93cb6dd06f---guxugodofasajozujixuxib.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f9efcc53bb3aa5514736d221cc5dcb4d/busofotapazativ.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210613032057.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/panaporutaxo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d234c1e526d---tununaseben.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/92461023472.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/33bb259373c6d7cb8489840f961f6d0b/kirilanasamutoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+adjust+a+pocket+door+without+removing+trimPDF 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_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 17108 bytes
SHA-256: 2acb6485ff58a1e0e65dde2c2a5b053002199dc6543436bc50be5fc0a7dc5806
font_02_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 11380 bytes
SHA-256: fa7d0b20debe13b4b4264f875d6ee3f92b294af7bd4ac7758b56e5bbf711e64c

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