Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2cf363340e8ed7…

MALICIOUS

PDF

108.4 KB Created: 2021-07-20 22:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e85f1ae0088cad1c20de68a65df397bc SHA-1: 8e21f0e1023d8c39bb7babf46299e7a6dfacec02 SHA-256: 2f2cf363340e8ed7c3ee273e4eb5b9f6e4781d61ae92dbdd6867449b9f51218f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting. This structure strongly suggests a link farm designed to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/jawekojegejajidavenegiju.pdf In PDF document text
    • http://dahchen.tw/userfiles/file/36291968543.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m4imr37dvn7erbolpgj4f3gpq5/78670266654.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7i6ubvjghm0u2bpicodq2fa3ht/58159488086.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/34175561582.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/h369j2jli93a2qkf6jrkm06b06/venami.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca51133f37---77442250229.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f2442d7b8---62582997122.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ec086adee---kupovebawituniwunep.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gk7q0pps38gmcbmtf9627p0pt7/jagikaxemigikolow.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6d74065f---putoregubanika.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/81493598264.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f16c0733d---84408810778.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608350b1bb5e1---38219020014.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/35439340655.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/wodenaxetavagufuwawol.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/2q922kr7144ig0qi68oe66284p/74564525594.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834e72445b---zigozejufodewuwerif.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b571c07795---xedujep.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160770df64e97e---73332562219.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e6b801d80---dupudilibelo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ddf03a080b239cf1d75081ab066f1634/nimatevanadononevomet.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/nataregot.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/44836543772.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/mafabenunulapijafuga.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/68879545099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=foreign+affairs+analystPDF 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_off0001444a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444A 18276 bytes
SHA-256: e0f7ca11eadbb1ec4d4289a00adbda7737c4911ead35cd0ba3e0c35398a06543
font_01_sfnt_off000172df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF6 10480 bytes
SHA-256: 859f5c5b7a505bfccd9eb3aa4a49dd99f752e0f8dafe6a1bd246973f95bdc057