Malicious PDF — malware analysis report

Static analysis result for SHA-256 8812c83455d1f669…

MALICIOUS

PDF

80.4 KB Created: 2021-07-07 03:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00724973a8f73d0e9f819ba6789f8ab8 SHA-1: a553817bbf2f5fa6bb4ba99d0d728c5086dac5a7 SHA-256: 8812c83455d1f6697490ff3f127df025a6ad136bb0bfc8e404e1a1ccb5619b2c
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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
  • 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://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95dd134ae8---21150437430.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/cb0eccf922ce740e4001ac11c5f219f8/kobeg.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/76400814463.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/tusavoxo.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/26394387401.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/lilerezo.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/defapifatubeti.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9daf124b3cf7b279330ff64ac29e6f32/dufisome.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/banerowegemamop.pdfIn PDF document text
    • https://cubic.is/userfiles/file/juzikogub.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/79479230969.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076761a90396---83535659309.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/nitolepudiwopog.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/75087295336.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/p8v7jcs232nr1plhjrpp7uvb5r/83421966798.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6e1423f7---jaxujoguw.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817b431fdaa---71684561413.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1803bb8a---lamewisefaredarutoxel.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a1e0b2248f1faac22796a5b86e74f73a/kenuvatifineteloz.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/41149960857.pdfIn PDF document text
    • https://iohrp.org/f_files/files/50729364320.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9a86634f8---legawenanirazimabolumukaf.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5bcd0dba4---6666135572.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v521e287fvros8npt6q3khrd01/banikoxixulesazenixa.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/96751536885.pdfIn PDF document text
    • http://namngonviet.com/user-/files/7642358185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=losing+a+spouse+unexpectedly+quotesPDF 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_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 17400 bytes
SHA-256: d1e947191600b4228e840fc13029bfc740e6d4305bc4aa346768c748c8eef593
font_01_sfnt_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1