Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b3289f30b20b06…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 13:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b0c34ca06e535fe138d9c4f529dd58d SHA-1: 3de6f7b964cb5a1fe1d52dd8102048e5a82903ed SHA-256: a4b3289f30b20b0648912b9247289de3912ad9d2b98c2f58b3d86a1d397b477f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://iwilldoit.ru/uploads/files/files/42111624729.pdf In PDF document text
    • http://capitaldanceacademy.com/userfiles/files/39070356577.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d977bc31---daruwupesifefi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f9d678af9---74118254116.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/tn6jd4srih5kj54lgup5n7kob7/61538949524.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/81387744923.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/nirerekixajevarikojutili.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/gemodeduzex.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/78101602757.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17d147d64---79015977783.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/39977655496.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/zevodakelitupefavovotarif.pdfIn PDF document text
    • http://gardatrans.com/content/Files/retagojugasibuwikumazonil.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/703c92d2f18946021266f6a2e341042b/sapitowelumakefe.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/637gv63im9e4o4gd3r97ns1e2n/28684333225.pdfIn PDF document text
    • https://majubesar.info/contents//files/12366857643.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/xetigitopezatidigusiga.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/gixoweginosemunaxunitig.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/pajapujikil.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/xakogado.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9551460da---24785909928.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/59857769392.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/kexewixunusasexabowud.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0a95aeaae71d402b09a6f01f03396d05/wesafadokas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ohaus+ranger+3000+r31p30+manualPDF 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_off0000c192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC192 17212 bytes
SHA-256: fb2d8fe76a8904ad6c839703633d1da3316f89e3e7e70a15dcbb8d5e03787f15
font_01_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10860 bytes
SHA-256: 7ba5508cf9324af6663d19b3bda0bab4bb6fbd758d31efbf45cfa2c2af495b18
font_02_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1