Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67099fb59d83701…

MALICIOUS

PDF

89.3 KB Created: 2021-07-22 12:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 26daa44c227178b4ba3d18eb982c06e3 SHA-1: 408c73d7dc917cb1f3ebc707d74d9e54d1d7e93c SHA-256: a67099fb59d837016852faa2ff970d12b9ceb7ecf096de030c44c3312a1fb6ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The presence of these links suggests the document is designed to lure users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://portalkucharski.pl/app/webroot/media/files/zusaw.pdf In PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210623_2F55138AA3CCB1B1.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc440e5c---28339326869.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wufosovudike.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cc8bcf1e1---letanoso.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/79025583025.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeb4edc38a---nuvigisevip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd6fd31ac3---69024057531.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ng527ui8hi6eg5et8m6np5u3ib/34728302131.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/givizasegodevaditox.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dd1368385---90265504111.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/67627843641.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/b2fn5arh3u88e3p4df7etvfmo3/mimibemakoderememumar.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/74738993868.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d05c4b478aa3ee2445904e6c10a42e07/sizilivifanan.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/70934075231.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/lozalapakewokewezisidev.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/46900045052.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c030d48b05d19aa8480216ea1046425d/82523367690.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/faxiferalapewoxaxabezimux.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e3284116---pagifududujuvozofevixo.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9ec09f95---gagamogog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=audio+visual+effectsPDF 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_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 10412 bytes
SHA-256: 72ed8ebca7e9a9c8d583793108a6047b73b6cbac078c1728f864de329c5ca4b5
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 17176 bytes
SHA-256: 963b89a2c71d27e467f5257f12c87c7733a193ec0aeec004db7e565b1d38fd07
font_02_sfnt_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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