Malicious PDF — malware analysis report

Static analysis result for SHA-256 031d1e5336182bb3…

MALICIOUS

PDF

92.2 KB Created: 2021-07-15 13:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b885193d4e24faead66d596d62f2d963 SHA-1: 86dcf8e4c12b80e60dcec7a541e13bfeae7cc7d2 SHA-256: 031d1e5336182bb3e8ca2138a466bd103395faccea95c00de05f5cf14b7b5448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, likely intended to redirect users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39fde13e0---povejonuzasuxorowamu.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/dimanerabutowanaso.pdf
    • http://naturalmis.com/userfiles/file/67222249719.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e8135e5999aa50892f1c663cc1aaad52/sudimajubewazewopatojiraf.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210708_B5040D77EEE332E9.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/8hp1am7ja1ibv1asm8647qq7fk/napetodikapulej.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ocjqsjoroo578bm9bt08vcl5kl/soxavixazaputimakamutiju.pdf
    • http://rjbmachinery.com/d/files/34019774851.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/lovumotafufuz.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f641cbd21d---kiwik.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02843a16532eb4416d21e64c4c857637/65776579220.pdf
    • http://abw10thstreetne.com/uploads/files/15173506757.pdf
    • https://cargobull.cz/res/file/gosujipujanon.pdf
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/97287884759.pdf
    • http://fd-health.com/upload/ckeditor/files/44057068913.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fnq8q4kdkk6ojklrjvlhnqs8q2/78308040968.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c56195b5---37757936505.pdf
    • http://sarlampa.ru/upload_picture/wududigufepipo.pdf
    • https://benqmusicworkshop.com/fupload/file/27814405245.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1070b424bd---sapugedebanodafisa.pdf
    • http://vom-ragnaroek.de/uploads/file/pareb.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda39503c47---jufomekilebaketujo.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160726c629807f---xefonadikasebud.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57ec78552---89994353455.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chiang+mathematical+economics+solutions
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 16792 bytes
font_01_sfnt_off0000f8b2.bin
ec6f74e3129fc158dd8097f4dcbed05f6a3d60fff6d68bac5838368840f7bdc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 10708 bytes
font_02_sfnt_off00011121.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 16244 bytes
font_03_sfnt_off000126d4.bin
34bb3a8adf6b05b883dd6dd5988961e770d0095b708ecbf5c93edbea9c40ea79
pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 1456 bytes
font_04_sfnt_off00012ed2.bin
710db3724f2b77e87e552f7d6a7d293ca08693b64259dda340273b4ab7df8e1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 18560 bytes