Malicious PDF — malware analysis report

Static analysis result for SHA-256 360c27a5431d613f…

MALICIOUS

PDF

78.8 KB Created: 2021-06-09 10:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f659c59863cd6fb0a733e752aa46890c SHA-1: 71b7e01e693ad6de6321be87bbed9851be37de97 SHA-256: 360c27a5431d613f5effd0a8ae44d234ade2fdfda84b283a3e57ff689fb815bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier strongly identified this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=ukg+class+math+work PDF link annotation
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098270cb78ed---robapewositivabugerekonez.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/cln9aprm7i64gocl0tuvtd49u2/22828561515.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/katewixazaze.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/3666583120.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/34vcqct34b7lmr9p4r1avdb8gr/fevanesigedilanatuba.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/puvixanixegobe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6136072b---gesatigefukiremi.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/qqbr48gml4795s1vg5dagse3j7/tusitotakodekaxo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tlh3supufouku4a32bi5qt5l3t/81441092722.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/erc5609tsu02kh9vs7o10p3k2l/segeve.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef88c54e2d---saxorij.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/91820131375.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7gut8f2sos81geo4t23tc2i7g3/wemelofugatuvitod.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/02p2bt0oil6as33gno5dgpdi8i/bimefomoxivugugexifulo.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/datemule.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a33dbeae4ae711c233edade697c2b3fa/sirugotuguxepesaledebam.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cekjnbglg1qsp4evdc8i2cd1r1/88971610630.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12790d338---girewovuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 5360 bytes
SHA-256: 7134ec52ee97fb5a629d4f45cd5414a741d06a80feb471f4ed02202b992065e9
font_01_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 11016 bytes
SHA-256: 026bf044f51866fef4acfda650051d5a346416144ca2d3cfb25f4a14a4960360