Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5adb6a34ecea475…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 13:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 451e94f53406dd1bde6c51da0621afe0 SHA-1: bf29f3d083b72fc9c19ad37dd0379f4e900710e6 SHA-256: a5adb6a34ecea4758d3310c84671425e06ee00aab5a55d817caa543c16c1906a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wsystem.sk/userfiles/files/taremefutumarosajupepib.pdf In PDF document text
    • http://gildiamasterov.ru/userfiles/file/61374782672.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/lpb2k6q6se2hqo39m20j5v0o9d/vuzejefuduvinufesikivo.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/16002991325.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/236aa6cba7dd06367e40b816e3c41ac4/riperijofef.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/20224892672.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b545dc641534134286294725a32d8846/guziwoxusipizekilutodi.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/rasimalamaxifulaf.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f17fc00dc1c---43116462594.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vvc062rpaptfgmtrff5m2iaofh/jukidejenikenus.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe95e9f5588186f772e8dc404cca47c6/witiwarezosaj.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/zidugudotuvo.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/68322027911.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/50515864844.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/kijasuginovixaxofubonuse.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8ca03fe9---81639661181.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/4447977764.pdfIn PDF document text
    • http://acelybio.com/upload/files/64198204813.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/lirekevokuvepafe.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/tokopen.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/21465779222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pathfinder+mass+combat+guidePDF 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_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 16964 bytes
SHA-256: 5ef9e9adc065b2ba8294d52938aa41aadae2da3913caf907e1cf7755900af3e8
font_02_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 11116 bytes
SHA-256: be23fa48a42423aaadf68663af141cf9b66c9b5e1c412f44d5472834b059c7d8

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