Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16b31334543a17…

MALICIOUS

PDF

80.5 KB Created: 2021-07-26 15:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6e10012fa920b52db2b21c210a05ef08 SHA-1: 1a85febaa14df447b72c2320ba2a7b1290dc1e05 SHA-256: 1a16b31334543a17de149e6eefa5b1f8b8777d2d3a613ae8c23fa88a33e83b0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. The presence of external URIs and link farms suggests an attempt to direct users to malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://dalboncostruzioni.it/userfiles/files/40886027112.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d48a4a8236d26e45be302016c20dd754/8491560111.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/9061635908.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/72934258420.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/04c4ce246e4b007c05e8643e1975dffa/rujukemovuriviro.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/90de88fcd5554b5a166e1d676976a041/41118248987.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/rumesoni.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/78530342999.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/xulubonuviwuxikogiwizediz.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/nomenowogedanipixokix.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/32758419344.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/41800733607.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/bizobuparizojewirena.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/laniluxejip.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/16727005588.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/eui7qrvhkl0m7lpogppcsebue1/51253261426.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/39734657885.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/zexixubogevirewunotipokiz.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d3c3b2f4f930efc31a3533c7d4d40df0/71452124386.pdfIn PDF document text
    • http://hncastlecable.com/d/files/gatofoxirupofabono.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/7708371980.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/9048197208.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gikupape.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607029d22da23---xopixunipafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=learn+to+fly+2+hacked+unlimited+money+unblockedPDF 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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 16688 bytes
SHA-256: e40cf81010c77b273debc068ee7a1c2be7ec463d1cdc7b8de8f01071dbeea4e8
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 11096 bytes
SHA-256: 21c69b1d3ea0c73edacca170fbdbf0340fe5f0bc7f813bf475602e74f5acd005
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1