Malicious PDF — malware analysis report

Static analysis result for SHA-256 f953749cfe93ddd6…

MALICIOUS

PDF

103.7 KB Created: 2021-07-16 00:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3653bd48bdb6e23415e08b52b51305a6 SHA-1: 7446dd04b5e9b340a040338e94d93c858a607916 SHA-256: f953749cfe93ddd622fe7c3101d888e04f3d386a6918259f6151e34aa0c2b711
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://afra24.com/basefile/afra24/files/78974569348.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078876f1079b---88245028975.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143a68e62b---noburomapanajasamibeso.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/44760451620.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210609184240580.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d0985dbc---77995316077.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/sizebegax.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/346722923689bfc331b35b06afbddb03/15318714326.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/kazudovemifedalexuzuwupow.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9cbacd709---xowafokuvosubiviteposiv.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/52151644896.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a74af881---fupuxabuputepudugasuzove.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bd34a598679---jupajobodatuginigof.pdfPDF link annotation
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f3a0661dab6fc9dcf029dd3694f4dd54/31550533018.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be607380ed---58633435307.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e9b0817918b0453c4d1d6399e2046b63/34503409490.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/sipobiwazovadavigezejali.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/97550162894.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a741ce1c5---rizuzawim.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/8941483429.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b4bcfdb6d1b98fa853a15fbac4877df3/73355192837.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/523ff005cf9fce1777b1cd81c1d787b4/memanapagu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pafekoxosepobok.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/bosugogigokememibomaven.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/37015070524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=crisp+and+clear+synonymPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011c42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C42 24060 bytes
SHA-256: 4d308857dfc2917356e694e6acf0c5a4eb31e36fc4757913b02929b187898be3
font_00_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 18792 bytes
SHA-256: 7776c79d387aa00b23540afd1443362d403f5f7f2c4d8039f514b941aeb74362
font_02_sfnt_off0001468d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA4 10724 bytes
SHA-256: a9b21d04c89afbce457b854b3b0627d210c424879f1b7e9a81897fe7c47c1328
font_04_sfnt_off00017732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17732 6656 bytes
SHA-256: e8a742485a598a6d259cad3f2e9090f8c9a02b7959db7080c1705b6a38297abd

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