Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d81efce4e60fc4f…

MALICIOUS

PDF

75.0 KB Created: 2021-07-23 15:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 9247517a4ebb8ca5af188949a3c8b519 SHA-1: c823535bb2c408d2a9dd9d3a94c1c49ca5a695ce SHA-256: 9d81efce4e60fc4f6145c5e380f96ac1ef4bf41b729584e3f93b0a080a8e1f8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links, many of which point to compromised WordPress upload storage, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document's content, though obfuscated in the provided excerpt, likely serves as a lure to these malicious websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2862

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/74b9da1f7f81a1138da49a61a654c382/72554480011.pdf In PDF document text
    • http://www.tomasjelinek.com/img/pub/file/97785391560.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/62455808809.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf9280a84---batekevugironenuwunudisu.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/raxesitedaruziledofesu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/78b4b59fe86c895d20ac11bcc8f8fb9e/votenepologoz.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390e24d55f---linolujaxumegevutaga.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6e680de6---xipumilokuzufi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/34887591161.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a411788ae---wesuxudolerejakomawema.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/fiweduludotedejikirifa.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/vakutixufaxumu.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/5406970928.pdfIn PDF document text
    • http://techbis.pl/files/file/64612822030.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077b51fe8a80---31203841866.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607156bba927e---36590422315.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a403b4d45b09007e0b07897b5473e407/78202590139.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/14627266788.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f5c732b58729af225cbb5f806abe9138/givuwibepadek.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b8310425b259298586ca023f67a47398/lofofalonolegufomofiz.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/dirigitomizujela.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65e441b5bb---25361106910.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78afcceaa---21022967955.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/63328833129.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608472c05f057---68413347959.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/60214757719.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/10189428036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=new+essential+guide+to+alien+species+pdfPDF link annotation
    • 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_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16836 bytes
SHA-256: 351e326a8d1d2d9d929634f58473c5194fa420764c32a09a61b4ab50e54bd56a
font_02_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 10860 bytes
SHA-256: 754d8c43336af541ecb1afa6570f40f80a2e5e1c1774d8a184086c78975c9924

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