Malicious PDF — malware analysis report

Static analysis result for SHA-256 55046f39c771b884…

MALICIOUS

PDF

78.2 KB Created: 2021-10-04 15:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 06145ee4f22a72c7bb63d4386277d0f2 SHA-1: 5bdec06b7ddb32ba95c644ba4c24b3ee1dad55ff SHA-256: 55046f39c771b88498dac99f461e21753a57f128fdce9471d13091d41430563d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly unrelated URLs. The embedded JavaScript likely facilitates the redirection or download process, contributing to the overall phishing and malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sahrugs.com/userfiles/file/73547786922.pdf In PDF document text
    • https://aquarell.ro/userfiles/file/74772636674.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/43076349090.pdfIn PDF document text
    • http://odumakus.com/uploads/files/wagejuxi.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/73752342727.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133648dd8b3c---57023287624.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xozebukawaninim.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/sabiraloduzitik.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/10997426987.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/81216896447.pdfIn PDF document text
    • http://neteyes.eu/editor_up/62444750643.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/44623305688.pdfIn PDF document text
    • https://projetovm.com/uploads/files/kimorinatimenojib.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109081229056221.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/bojonafilekove.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/36023797738.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kebuta.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613114c180afc---33153019682.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f02e765d98bb4fb91c5af3fb195b68c7/figexedugedunakosogi.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/fuvunibuparinunun.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d0299c8d---10551520485.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/81865577098.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/bonapidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bus+driving+3d+game+downloadPDF 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_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 10972 bytes
SHA-256: 5fad67ca67872a0b782147bb2f8443db51d1c6f09ac2779a865248b389f64153
font_01_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 17616 bytes
SHA-256: d0914e33dc770ee7f2427de60f1f592e0a52ce2a7ba47d33ca96a93b95b87445
font_02_sfnt_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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