Malicious PDF — malware analysis report

Static analysis result for SHA-256 af582ca9e2c857f3…

MALICIOUS

PDF

59.8 KB Created: 2021-10-01 06:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccc490d555549195fad4796dfc2dd8e5 SHA-1: 34380eef201122cf985a52a8d0a921507ba25345 SHA-256: af582ca9e2c857f380fc31b25bfc46404b64beae2e1093aebe7ce7700af30082
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2660

Heuristics 5

  • 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
  • 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://studiobaliva.eu/userfiles/files/pelanesizewemuxab.pdf In PDF document text
    • http://manpukulivermore.com/uploads/files/20442798591.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/62448238255.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/67515386260.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/88035333444.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20faa9e99---dasojesokemuremogex.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/90514145280.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kd235d4uukgpu4qsodto888aa1/tukuzipeso.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210901_59A42636B8DB1197.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/7186981589.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/jexobemijiragixupigejolug.pdfIn PDF document text
    • http://hla.vn/upload/files/74921712094.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawijor.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/pefosalazogopik.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/20dc4cb67441f3c36df61f86ddecd6b2/16581924724.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8f99747d---94729873.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/nobifuribeguwipokaliguf.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/99899079783.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/70093935362.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/pedaxi.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/82885568633.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/pedoguwixugijelexosofa.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/55429421470.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c09d063c6e5cdf0c39b72e9603c993af/49688379186.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/29008776513.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/78f7a4a139103a0eae464317e43c576d/fezexovediboreget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+farm+frenzy+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 10512 bytes
SHA-256: 35abb153f1d2597fd2a2239993848471e3ebcad6de2f2111eca2c8cd4875de81