Malicious PDF — malware analysis report

Static analysis result for SHA-256 124c7e63b246c3d2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 06:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22ff0d1fa917465bd23d6f2626d060f6 SHA-1: ad666ad2ab87d3ed1b24064a2245cf6f7f502bf6 SHA-256: 124c7e63b246c3d2a2c82c3a4880961e10c70a8f34798f2d80e9a773bbfc7016
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates malicious intent, and the presence of multiple external URIs supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=how+to+see+private+instagram+tiktok PDF link annotation
    • http://dobrejaja.com/Upload/file/65472039131.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/48146739089.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/kexuwepedajezavifej.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/fozemekaji.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/bowerasimujetagit.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a2fe59e94---13835759547.pdfIn PDF document text
    • http://stonebreaker.at/mimivafuxoduwuv.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/fodudisuvi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba174dd02---26572804438.pdfIn PDF document text
    • https://preciseenergygroup.com/media/xupavovamuvajitufimuworis.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nvbecrb1i11mjdrqmjg24luio6/70317689871.pdfIn PDF document text
    • http://cityfate.com/files/files/75559019800.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/katopekupumivul.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/mukadibogelobajobezodinaw.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/17586119975.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/45216281799.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/48453574364.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161389c7ad6dc1---83719144181.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/zilasavul.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mbc9m37kceh0vh55fikmmg5t9a/modepebanuv.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210917094428.pdfIn PDF document text
    • http://artio.pl/files/files/60255523370.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/3327993069.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9e349e57e6be595fc78991e2e229f2ff/fatasubegudokome.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/mamelag.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/tozogowof.pdfIn PDF document text
    • 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_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 10784 bytes
SHA-256: 8aec2d9b1724e8ae563257a54c8ea0a5a3c2b85af36912db2ad1b11194d476e8
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 17592 bytes
SHA-256: 1489d91e1794d98ecfdc46cf38fae73ceb78d5657eca5ac686d63732c45b70f3
font_02_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1