Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaaa00accd4a5925…

MALICIOUS

PDF

86.6 KB Created: 2021-07-23 06:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e1045be37b5982979d1a379ed05175b SHA-1: fcf1d15de0fdfe8ac7c7366eb7117f68cb268ddd SHA-256: eaaa00accd4a5925ac9dd43489251c3791a7ea57baa7b193abe34fcddc0bb12a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/908a1552bd16149617922ce3a065dd5c/77065696763.pdf
    • http://zulassungsservice4you.de/bilder/file/86953832495.pdf
    • https://uclerbaklava.com/resources/file/47196149777.pdf
    • http://ldbell1965.net/clients/85689/File/wubilirawidofe.pdf
    • http://tryinvest.eu/userfiles/files/62408837009.pdf
    • http://www.hydro-tg.pro/upload/file/bixiz.pdf
    • http://casaatlantida.com/userfiles/file///34532957780.pdf
    • http://quick-thailand.com/images/uploads/file/12582182606.pdf
    • http://bindashnews.com/userfiles/file/pirapulamoxigisugisadeg.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9b869a49---2317218418.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0eba0f17292d0effcb5534fe8b8c6666/8209552703.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb46d83c2---87352460969.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb124ff30---sadelifilusegux.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160837d3715c53---goxefuges.pdf
    • https://bimetoor.com/basefile/bimetoorir/files/zurovaj.pdf
    • http://c2r-auto.com/uploadfiles/file/2021060104535573499.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6874846f---24138518744.pdf
    • https://mimpishio2.net/contents//files/46998387618.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a63dc1740---91020269580.pdf
    • http://ikuma-car.com/js/upload/files/pexezoviniba.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f6ff17863186d5510f535b2557bf088e/72002617667.pdf
    • http://progfin.pl/userfiles/file/43838545277.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=indian+cricket+team+old+jersey
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 16792 bytes
font_01_sfnt_off00010461.bin
6b991e8540ce211508dadad124e8469e14da25ed804d3a9699bcdcb2ae17105c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10820 bytes
font_02_sfnt_off00011d4b.bin
e3374ab1e11ee1381f3bf17070318a6c3b6f264b78b3b1b11fe9434d1c66fff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 17856 bytes