Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e71cf024d7d569…

MALICIOUS

PDF

84.4 KB Created: 2021-07-06 11:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a52d29be4b22133e9eca79c61d40dfa SHA-1: 23083b7b730dd5eb739a16b009d715dd12820ce2 SHA-256: 56e71cf024d7d5699362833dfe9cb82f172be0ddbdd72581aee0bc86732938d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b452686f362---zudijorelogemij.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa876c69773---85199419599.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c75392b33---kekenere.pdf
    • http://bhk-aindling.com/userfiles/files/xomajexi.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/o37highjo3ar27l5grgbg54cb7/77059912449.pdf
    • http://appletechsolutions.com/userfiles/file/xuvip.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/r10uk7p1sji7nbil9jmlrknhu2/75286792855.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430043315430220.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c3498ceb---28422881707.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0c966a1c0db3183ca356e1479495fe31/8021886037.pdf
    • http://alarmy-kamery24.pl/userfiles/file/25777842601.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60c8b87cc---92107256312.pdf
    • http://chataphan.com/file_media/file_image/file/79306485038.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210530112902.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cbb984ba153ecbe65ec0f909ced7d2ab/zodozebolizu.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/05e6eb6833ed1ab7adec55445b174e36/44246380208.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b69488e1---63730455724.pdf
    • https://tese.in/ckfinder/userfiles/files/35503902719.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ef66003c5a26e46642ad94574b4d0bf5/junozirawe.pdf
    • https://kisikana.hr/userfiles/file/71189016445.pdf
    • https://study4student.com/cache/fck_files/file/xidokuzelu.pdf
    • https://suacuacuontoanphat.com/upload/files/35427785266.pdf
    • http://turinhotelcompany.com/userfiles/files/84897397520.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0e5prjhfqh4hl8jgar8h8p78q0/21810061209.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/eab6027b63a31b83f4e86cff1ac36a2f/39972395536.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cbt+test+questions+and+answers+for+nurses
    • 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_off0000e6f8.bin
4c77234e19f2d86b25a071d354f47a0af624a1bbff64b3f200941587e55f845a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 10804 bytes
font_01_sfnt_off0000ffe2.bin
0bbfa6d13c54aacbc478831b4701a633c67673770bba76d44dd97d2d69e1778d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 16952 bytes
font_02_sfnt_off00012c40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 16792 bytes