Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caa9aa6b533b0ba…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 13:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e96db788c628147ae88df6062ec16fa SHA-1: abbaa4d42252555c46d4d823b92fabfc6a75c3f2 SHA-256: 1caa9aa6b533b0ba68d4310f6a7bb09ff89ad768ed28ef40cf1ee90b6ec48a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161352e38b751f---30040564855.pdf In PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911181541903085.pdfIn PDF document text
    • http://innotack.com/userfiles/file/dugolomevavewevagigibot.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/17125778008.pdfIn PDF document text
    • http://hidropro.hu/upload/3163210509.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912093047.pdfIn PDF document text
    • http://ceroki.com/image/files/tedemibonesorixuzazoxesa.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/soraxoxa.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/firebekarewi.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/58841848245.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/xebapin.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/42936581279.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uv1t3l0m8qqg08r3i8e9klgqn7/20982247768.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/lulowebafuxisovaligokixa.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613106dcddac3---gexomekimikasipasefuv.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/wisinekibe.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb7c14e5b---xekepogupi.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/60749563277.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nodixafikuxemodajizin.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ac3f32bd4a5886cd81279559e229e0d9/winixasi.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/perituganemu.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/lisojipiruzebupup.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070700108094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+server+address+in+vpn+in+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 17492 bytes
SHA-256: 37179c7a88c9803b6ac14aaa90ebce93fe2354d452225f0e56a7b7ddb6a638af
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10500 bytes
SHA-256: 09274f0919b4ac1c098560d397d917d8d7518c5303bfcbd7fd46015e44058265

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