Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b38050bbb1962a…

MALICIOUS

PDF

80.8 KB Created: 2021-07-02 10:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b55e4128ad8ee1166524ef86bbb1f85d SHA-1: b7a464f02bc07864eb0efbb1f25259f0464834db SHA-256: 92b38050bbb1962a9b99e30aaf4399c336e4a50706b044e756430de633a8a88c
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple links on disposable hosting and the use of UTM parameters further support the classification as a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cructi.ru/uplcv?utm_term=if+you+do+the+cooking+by+the+book+lyrics
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf37f0a59b---25843728422.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074215fb3493---jezazevijepidudegim.pdf
    • https://alkathirilaw.com/userfiles/files/vikexabozaligovenum.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec070f03f---90446205808.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160884b543aad6---8191229370.pdf
    • http://ilovechardonnayhills.com/userimages/nenavodononubu.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/dafojaxolabadofugewo.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1058cb4a---vataditavixedunirumigitox.pdf
    • http://alphasigmaoverseas.com/userfiles/file/wexedukojevedep.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc227bae19---witetutiza.pdf
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/1239568451.pdf
    • http://stacjaregeneracja.pl/userfiles/file/nokofimikajepovo.pdf
    • http://93564497.com/userfiles/59523017952.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af58818f3ae---vikiropexevumozusid.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a2eeece3---zifemebafudogudu.pdf
    • http://kotolantopeni.cz/file/jamusomagu.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210527185609.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608994983fcd5---rijafivapivoxirobanuva.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6464c409a27500bd8515d68e89c878f9/mokafigapasujojot.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/7950781382.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ee504ed9---tisixunoxepizonegutunozuv.pdf
    • https://carrieres-pierre.com/userfiles/file/zaxorumajepifaxijan.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6aa8d8ee2---12668191805.pdf
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca83562b25---jegafubenuxenufow.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/98f3a2929672d45026d89f3d8e7c6187/84118527169.pdf
    • 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_off0000d3ff.bin
57298dddcf11b2da257769103f7ee66870e728f7178453a634071eae9c594011
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 18384 bytes
font_01_sfnt_off00010296.bin
03cd2d566a243f2703ab9802bf9a36c81499fd2b129ee41ec978d727b0cd9980
pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 10992 bytes
font_02_sfnt_off00011bd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 16792 bytes