Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b7560eb3710d86…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 01:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79e355134bf8f9c70a794376e468823b SHA-1: 2f28cc90140f8c14eaec0c373517d4266617a6ca SHA-256: a3b7560eb3710d86317fb698f825550d8b23438ff80981246d3cab16e4555a12
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://btegypt.com/file/zonogam.pdf In PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/92938820922.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/82f3818856bfdab5a86a74aa0a9f22f3/49455618081.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47f7349ed---wobarimub.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/j50vh74rad3i1am3s0metuu81u/pivimusuwepapubomolap.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/rejagesa.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/vizowuxavisijutuxuzux.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/e0qc4mtttcq1mkatmb02c8umu3/welejibonemitesuzogalabu.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/degiwabew.pdfIn PDF document text
    • http://artospace.com/pics/file/bamonasizorobefod.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/86e74a183c0904848924be708d1ca646/29227743533.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda2b9c346---ruvoserew.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c12d3892ea8aa7d2855f3cbdc862ce30/37488836829.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/sunupepesukewexajopibaj.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/739040ff724fd7cee1e143c04f5d81ba/92773303018.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3562fc01a910d98307be4076c0a7e93a/tafivuzepukoweb.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f035d7c76---73472790888.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/momosuviniwewewusa.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/xevak.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cfd6b81ca15460ac5ca472af7a666d29/patukazu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/benarorap.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/aac4b8b775c101e15aa1132a515f386e/64471191369.pdfIn PDF document text
    • http://npas.ru/pic/file/tuxupinok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=journey+map+template+pptPDF 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_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 10360 bytes
SHA-256: 76fc78062dd81f6faf0554f98dc8538f7d7d665b1bb4b28244be1b71b1d8c10c
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 17464 bytes
SHA-256: 0790d57c75ac7b8b6363d523f5b091e0b767f71844017f1cf893624a55f30702
font_02_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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