Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5f30a123f3bd77…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 03:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16de17c29b362207900f4d79c306a141 SHA-1: a427f92ae0c23ea995f3cd4faaac4b21f95990d4 SHA-256: 3a5f30a123f3bd77cbc71a2d4d2aa7065a597942cbe7ab52f52df8217ba69e64
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 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 https://pistant.ru/uplcv?utm_term=fearsome+floors+instrucciones+pdf PDF link annotation
    • http://lex.tj/img/file/jovefafazovotitajeja.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c970a24b---12203424914.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/37048036922.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/86b4ae48b6766880b5d39ad7583884fd/75435130392.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607285326cb19---najez.pdfIn PDF document text
    • http://pasaru.com/upload/files/xijufozedupoxuvazuzugu.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/10468872193.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/60286863057.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/pogedudaxosalaxuwa.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/20637267451.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/joxonajonubijijuxoj.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/kajanurowukewujifuxuxez.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbaa969ab0---jimipupesu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b73d7526---deziwafalopegutevo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cftf4s7qogahalh3t5jccsid27/jupogabobuvegixiw.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/merojejegavideza.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/74127965295.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbcc2740a---dulofuxewi.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nuduwuxojatu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/o6ijie61fvh4trct9j3mgs3km3/5014343754.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9r7p07r3ml6k4hge99phqv59mp/xopewol.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/50675225327.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b77db906fb2---76208231291.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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 18444 bytes
SHA-256: 848bf95f9cfeaf44c66926251c88f3b7346aad98faaeccd13fbf276c234a63c7
font_01_sfnt_off0001081c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 10860 bytes
SHA-256: d3b0e28561f15aac9caced85b8e8e6904295f8792199d402347e206b0dc7df46
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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