Malicious PDF — malware analysis report

Static analysis result for SHA-256 4887189dc3dccddc…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 21:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 868bd846a40b79434eea3914cf52f9e3 SHA-1: 5405e5304967092f05da3ba5ced5df9fc5f764a1 SHA-256: 4887189dc3dccddc78c450c10d82fe24c8747c3147ccb3023a9d07558d45f3b4
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself appears to be a lure, with no exploitable content directly within the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hotelmitrutarija.com/uploaded/files/ninufixitasulalaveje.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878c7bbc87a---61617303025.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/vuxekebidaxiso.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a672aeab02bf67846cd4c7b8bbb220e2/kawiwiletefo.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/domuxujuvi.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/66869833444.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2a08333b---87972501163.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/lukow.pdfIn PDF document text
    • https://rajakedua.com/contents//files/48114732575.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ffeq2s82s87vjobetf6s5mn264/naxij.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/lelakamufilinugegamut.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/0207490a948df6ba120eaea093354c23/94590401575.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac10e9246---rewenuvuvagupakoxu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728b197d42b.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/65425241857.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/38414861577.pdfIn PDF document text
    • https://giustofiori.it/file/katusuxejabet.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8uqrup4c7gt7olgddlro5sip1l/lomaxikowominuso.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/79400298959.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ea47e5fb05560278083afea2594602e4/17906627111.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/jutufiwowukotim.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160832935c85c2---zekebuwexusajikuwaj.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210826181215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=referentes+conceptuales+pdfPDF 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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 17720 bytes
SHA-256: 32decb96ea613421d2d4377685cb313a7b2adf3e6af47612798000595ecc2aa1
font_01_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 10668 bytes
SHA-256: 5a0ced77723de27b887f71e29173f9433eabb4d0373d2a508d27203eb8d994fa
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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