Malicious PDF — malware analysis report

Static analysis result for SHA-256 192ecf8e438df9ca…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 07:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d737bf272e30db1e3f53f5935e188ab SHA-1: a5832cf30c00586428e600d694dc183c50767e4e SHA-256: 192ecf8e438df9cac133aba13fd002757ab762da321c9450c77b10a02b2ca72e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to redirect users to potentially malicious content, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fa5eb01e15e1931f6b3f3243771aca1b/togitad.pdf In PDF document text
    • https://ev-owners.jp/userfiles/files/rekirulipilupuvaxejajoku.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/tekikaxatuximililamures.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/14729895872.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116fda188c5b---39816009403.pdfIn PDF document text
    • https://izr.fr/files/ziguwekubuximukezab.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/duxiwinemewazugege.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda3212c892---66854909192.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/gezexis.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/sokewutulutekojulitigebed.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/33836421056.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/mrq0ljo8hv933mmi8mgfc5rrkl/94585032622.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160841da61e9b2---riwunegipi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/clr7ofitlav62cj7dv3sugmok2/lejakotenopilipubenidizak.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/19098269908.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8f1e369caf445517914266a624de29ac/37641283963.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f914d6b3a3---5898059066.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/56509783485.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/da540d57694ef31b326bc7258f68b66d/zuxakamer.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/54647842805.pdfIn PDF document text
    • http://vtaky.sk/media/file/golovadojuwezavim.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/s7u2arq6nn3tnhbo065smvp1ja/xudemavokadejo.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/79956597563.pdfIn PDF document text
    • http://moneymaker-gold.de/files/pesenavijaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=greek+coins+and+their+values+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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 17476 bytes
SHA-256: 223e64ebe2ea874dfdb1e76f4086f0c603d59a58ccf0af2b9536c19eb0bd15c2
font_01_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 11016 bytes
SHA-256: 60b6a6c68d99588c06c033125a51a1b8b766183a90aa04049dc9e88eb4bae752
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1