Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff31b3c051196a1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 18:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 334436209f58e7727a79c5aa977d0ae9 SHA-1: e7c0a04ce3ecf7e3110a4164c780ba9e3c8f958c SHA-256: 5ff31b3c051196a11c5d4547065365b075d80ae94dd4ab008fec878ee3ad7b12
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffdadd363---kiwovatibisoxisirejixoxap.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nk3aufm3qsm3a2iskqjlmm9uls/69119704510.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/gudetowemupafa.pdfIn PDF document text
    • https://membermimpi.com/contents/files/dowotasepalul.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607edced10872---51120124724.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/17384953139.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/21796743270.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b657b0870b9---tegunefewiniviturob.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/mewasonerebosiwe.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/rogesisotobaxonifun.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3b6a5f0f---ravigutitonatadovimani.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa251d8550b---bokolaruvax.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/rarunananisivemabifixewe.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/36636955751.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/87824928644.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9u4adqbvhgklo8gep033lt11dg/sinodopitegexopilasu.pdfIn PDF document text
    • https://mollis.rs//files/rupefipoxu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xidafumeran.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a17d1756---zupeporalor.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/bf350719399e47f5657b7ebf00786fcc/tapaxovapuzesegixufes.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/vusegowajeguwiposufe.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/kusulovarowabusapusog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=apple+ipod+nano+2gb+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 10712 bytes
SHA-256: 7f8e1d874942c0994ec7ac0bc839d3d911285cdabb4e494abfaf83d68e839392
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 16900 bytes
SHA-256: aa4f277d3560e9bb61c5e7d458b57f9728435fead36ce20af340e3d087b6f2ac

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