Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d36b0a632cbdd69…

MALICIOUS

PDF

119.6 KB Created: 2021-07-24 10:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f197d44764b77c5e342ed6e2bc7898fd SHA-1: 998db01740c18ef8da2cebef3684a140ea4f2dce SHA-256: 5d36b0a632cbdd699338b0b55d77c703124fe634bc5e1519b4c495006723046d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards an attempt to redirect the user to malicious content, likely initiated by embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665ec73cf5---79317199645.pdf
    • https://ndmoyun.com/calisma2/files/uploads/21964108800.pdf
    • http://hevolta.com/upload/file/85031280918.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079827593ee2---83963331825.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b808b2d45---71186662398.pdf
    • http://richmediahouse.com/admin/uploads/file/28183337592.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dfae25c2a---24990337115.pdf
    • https://groupunsur3.com/contents//files/jixoxonejofuwitalujes.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/0aef76464e781b8451fcd960a3f063a1/15570222021.pdf
    • http://bronia.org/userfiles/file/48138588526.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df9970a24---towuxebizenosu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075611854d4b---44971961749.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/muxelojomoxogi.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/turariborum.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d946e8ac1---32801076466.pdf
    • http://tokyoto.pl/UserFiles/file/87274416160.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2e9fa0d9d160ec262288b27e97ac14b4/veguz.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d48bf1806---wifoxadifuloso.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeaa11ce0a---jiluj.pdf
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/63609477121.pdf
    • https://vatlieutaphu.com/upload/files/5422952228.pdf
    • http://brenna-ski.pl/userfiles/file/82618701924.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf696b87dc---26961146034.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b0ujv8l97tuk5rhk4s7dgtopr7/78439262878.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=samsung+smart+remote+guide+button+not+working
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00017602.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17602 16792 bytes
font_01_sfnt_off00018e19.bin
81d474fb6af3e3c97b8770fd293946dd0f33df8305732951e9e15bfdcc1cda4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E19 11040 bytes
font_02_sfnt_off0001a79a.bin
869ca014a5f44219f1cf184a06e07305593cda526b7ff111934afb3568cd94b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A79A 17548 bytes