Malicious PDF — malware analysis report

Static analysis result for SHA-256 469571be2ea68756…

MALICIOUS

PDF

85.9 KB Created: 2021-06-15 13:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 790b3953681922c0ebdebbc36c9ee58b SHA-1: 0ea2871d8f35bbbe434799e1abe6890b3af7ee1d SHA-256: 469571be2ea68756a4baed7543cad191d9159519391d512d2f3acf30dfb33de5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=city+car+driving+hack PDF link annotation
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a8dd99f8383118d028c7ed8739136cab/faboxemugikureve.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/213ed3e74bf0cd2e3cb9ce4d38dc6b5a/vadevebade.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1622890687302434940.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7eafbff27---sugupodusopowuvevewifexa.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7de2eaaa8b18d1e1d0a13c5cab2739ae/98188455598.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/fifimajozexezegewawatabis.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/907b029bdbe56170760cf342ba4ad0f6/romolenuninuluduf.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3358ad9974fd39075426bd24e6bd7d64/11715973360.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d897f18d5a---76397633461.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/66789531016.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ad3c125642e4f8218d9d2b8a17a43a77/59825463321.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zojowo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa239be06f3---13313226414.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a4549491c8e51aa2cf27df491671a7cf/96058613103.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/19130720625.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58f90229e44db2d4bb4a64a543c64c78/40563533090.pdfIn PDF document text
    • http://akssert.com/userfiles/files/91737294646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 4800 bytes
SHA-256: 46c48ca10d893354c5a431c554ebc5f3f679fb4201b7fc8617dc85c40fb7cf65
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 13172 bytes
SHA-256: f4a562df3d1190983894019e37c3d23677d37ce861f4a8bb419bf832cf63b678
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3
font_03_sfnt_off00013be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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