Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f2e06c7a5ee687…

MALICIOUS

PDF

70.6 KB Created: 2021-09-08 03:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a98f92e17ccb51b74a87dfa25a667677 SHA-1: ea35ad6cf0be6de474e17fd1cee36319a7063401 SHA-256: d1f2e06c7a5ee6870a36971198a80d5d82a96054e01b0fa7e031e0041f539e28
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs, many hosted on potentially compromised sites, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://snypes.nl/img/customer//files/gixeropovapinatimogoro.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4b60448b---nogadibotomejara.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/dukenaxigisusolarinab.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a105b01bb64b7083543268bb4413f899/70711230019.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608983e97f42e---65164418926.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91606314629.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/79004583485.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021072222503594.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/sefuxebumulen.pdfIn PDF document text
    • http://afslab.asia/upload/files/fexabewarumanusifeg.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/36414343755.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///bevabukidimez.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/38492991845.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd5c6911b---nedanof.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8838bdbac---17534640980.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/2494182829.pdfIn PDF document text
    • http://asfalon.com/__files/file/94964206806.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/zewopegisesafodirale.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/1519342321.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/87484786977.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41c161523c---lolikefubomipiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dimero+d+elevado+causas+pdfPDF 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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 16568 bytes
SHA-256: 74156ae9be633f2027ebbea1449b955de90b57960168793ee11321dd30a9d54a
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 10744 bytes
SHA-256: b51b2dcca68eae0c4e2798511acaced5948d434369d47f73c6e41e7ba8278143
font_02_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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