Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b805dfff1441c70…

MALICIOUS

PDF

87.0 KB Created: 2021-08-09 07:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f4c55cb3905414a9d20425cd2b6cdba SHA-1: ceda832309627e85b9acfb05bc3d1482b4da55b1 SHA-256: 8b805dfff1441c7091d4f45be29d9c780967e203f973b9f6e02c92cef45c455e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, directing users to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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 https://irlanc.ru/uplcv?utm_term=que+probioticos+tomar+en+el+embarazo
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mogurawi.pdf
    • http://anandtouristcorporation.com/uploads/86027661421.pdf
    • http://alda.pl/ckfinder/userfiles/files/84692523004.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d7629d0213f1665147f73466285f98e6/10538967830.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/49130093131.pdf
    • https://dianthusindustrial.com/resimler/files/pupobagifomasusoror.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/66ncqe5vcualn125iro95t67ju/19107399876.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/sosokolewiwenejinuru.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e55fad75d8a71b6514f0afd8cd8d2e2b/38527091911.pdf
    • http://rauvuonsach.net/images/uploads/files/78725623470.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4f64c472---3779164540.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160763ae8f3b7f---dafomadorojegodirezibufef.pdf
    • https://easy2ticket.com/upload/files/3024500701.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607652ee37d43---guzajolokubegenane.pdf
    • http://446888.top/userfiles/file/lemopuruja.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb30a51d6c---fuxixexusajagibolas.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/fezusisedokomutowajejof.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/89458233621.pdf
    • https://cleaner.pl/userfiles/file/12151310729.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b2df23a56140304e6d4bb50f5162124e/70149097176.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/25095f9d75920e83f7a53904289fc615/gewazoxitalaxatudaraxer.pdf
    • http://learnazia.com/fck/imagesfile/5146684640.pdf
    • https://masihpt1.com/contents//files/lixexibenawirususi.pdf
    • 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_off0000ec05.bin
8f640e2f9fa22e01973fedd3e8137e7d8bb7360a2ac8edcd9ec6b9397fb8e8ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 10896 bytes
font_01_sfnt_off0001051f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 16792 bytes
font_02_sfnt_off00011d31.bin
0b7f3aedeebf400a828578245cda451a69f0260edb82c472be065112e83190a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 18312 bytes