Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fa83ddbe8fa709…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 03:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73ed9bdc2afd1ac818382379ed02614f SHA-1: e051fb11ed65e38ef1d7fb599475692b2d296bd4 SHA-256: c1fa83ddbe8fa70982e9ca933b0bee7923747077a55e606bdc9b7b76c542ce4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The primary attack pattern involves leveraging a PDF document to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rgn2u.com/userfiles/files/83863045193.pdf In PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/jebisojefetowakulipas.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/vokatitefi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0dd0524406da3193687485635efd14c5/33449782618.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098372167496---68109777732.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/wisowemanowa.pdfIn PDF document text
    • http://home-plast.ru/foto/files/62514335377.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/96923316615.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd19c622b42---23142654918.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4859e62bfd---13716421806.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f715934382ca59165a35a94fc1a1c6df/pasosuki.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/27128889348.pdfIn PDF document text
    • http://video-cycling.de/files/file/45405844119.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/vopalakitobidimutuj.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c6c1dea8c9fb96133a68099107751595/dolud.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/99335989132.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sagerizolisukamuroni.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/jazid.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/gasivorozexoz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9bc703658---xopilitifakipugi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/01926e595ccd113053ed36680b7f41ae/97417287434.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/63194368807.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0546ca221---lozimamov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=buku+uud+1945+terbaru+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_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 16872 bytes
SHA-256: a33a4f3bfd5e7f71a23b785a8d4bc6cdb5fb779f86786a6717b8632e9eb10751
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 10776 bytes
SHA-256: a45c787a720564c3d948edc7aa1af190673f8cd6a536479e713e7a9c47413147
font_02_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1