Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8fb6ff23a7214a…

MALICIOUS

PDF

109.3 KB Created: 2021-06-27 16:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7794f2778ffc99120e68c2a0ffbc5903 SHA-1: fff053107e993a2609f996186ba2412081f1d6e5 SHA-256: fc8fb6ff23a7214ae127fb5ebfe3619edb54cb5997bc029dc7da66c1d3365a81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kids-ex.com/guvilupananubu.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f003d2bcef---71094984996.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/03a01247d49486131124d45a2b581013/84613897410.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8f68ffc6ebae65cb5cb9d12ca1fd33f1/mamad.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1e2036e55c899a13cd0718d3356356fd/wisodeduxojimarokujip.pdf
    • http://podushka.by/files/files/tivabijorutuwexalesonosu.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dbe04dfd024112ddc8fabcc50c65045c/vojili.pdf
    • http://b-solutions.net/userfiles/file/vovafaragisizegeludarela.pdf
    • http://modern-pro.ru/files/file/pakoseku.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/pejavalefituparo.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5af4b2571b9ff1ddc2d11f8cdefdf5ae/60522497813.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9rk7qag90f6i2ufaivj4qjos7q/55261595403.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/susebiposogeze.pdf
    • http://sukhabalka.com/files/file/8337138341.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c3a5b64720e8244e0aaab108a48a7e4/fanuwitogoxuwababetumebof.pdf
    • http://akhsmombasa.com/clients/861898/File/devifividemedufafopemig.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2330948ec27363d1eb718156c86e4e01/telizejubag.pdf
    • http://absolutelyneon.com/userfiles/file/vawuxa.pdf
    • https://actorconseil.com/files/file/dusulokujuso.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4d4c916fc384a8ce836f70f8b78cf4f6/bigunomuwekefibavovuj.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8b1c18ae0a1d51cebb2d4a7c1008e0f1/fokirupuxabezuf.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609212f1ef938---wawudurudas.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a669a039e6d---batofapamiwu.pdf
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/42035150419.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=palm+beach+county+road+map
    • 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_off000145d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145D9 16792 bytes
font_01_sfnt_off00015deb.bin
d0da827fd44607dc735154584da8e9846f562f185553500b0bfe5aa48a461958
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEB 18624 bytes
font_02_sfnt_off00018f09.bin
d38e89665485a1d1975d905c5eef3b8e56a7f340f0bad9b366c5758541663564
pdf-font-stream PDF embedded font (sfnt) at offset 0x18F09 10876 bytes