Malicious PDF — malware analysis report

Static analysis result for SHA-256 2934efe9ab76ce89…

MALICIOUS

PDF

86.8 KB Created: 2021-07-12 17:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7521e2da398106ee46746e4895a25d5f SHA-1: 2f27aa5c5ff81cd3f7ace28ce7cd7d7f49444f62 SHA-256: 2934efe9ab76ce89d3f883e16c501d5a010d7d215f6ff5777166bb2af3fa8bf8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and contains no readable text, but the presence of external URIs and the link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/h7vmom4s9v13l8s04j9mun75e0/lazadajuzokijebagipaga.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e060af1419938bba882aeccf7ab780fd/rawazurexoxi.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c62f6d1947e59dbb5b6b80a42fe0cc45/gijebase.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/10460416697.pdfIn PDF document text
    • http://midel.me/userfiles/file/98420252065.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/60771504435.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cbeigplgoegbffd9iseq1l7e5/vejusalorezebudefal.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160df9039c3ca8---90517929249.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c7be51a98fb38f31e05014a4d5aaa7d2/repisogufetowex.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b3996277c7f---zozewujulotelorisapanetap.pdfIn PDF document text
    • http://placc.info/up_image/nidakimitede.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/xepijanajixaripigozulekuj.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/88590004233.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/livamajisukirelusisizal.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608091e8c2023---varuwinobuletalak.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9dd66e704d51185844ca990861c5c481/kosibojerowetiwaboxizor.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/uhopo60b9fanonabfk39e53902/jowoz.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5885a428b1bf34cdb1f59ef2260dad6b/tiluvasa.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/0c41fa7162ad8c572e9221dd25fd5d9d/pozidofuwadosa.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cfdad8bb---99266928700.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pozevivud.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/aa466e5ed554dca294eae42e6fb749c6/90685414204.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///ravalesexipevutuvaga.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2f69f25fcd7976a6291799af7ed67cbf/54850228935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=adverb+of+time+simple+present+tensePDF 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_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 18432 bytes
SHA-256: f03f6a293cd44fd4ed08353aa958d7ecbf20a8115a552b48dd0de9dd071c0f41
font_01_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 10684 bytes
SHA-256: c33ba0acd48d5737d7ac31bd77d90ae43cc6f2acb1c2c07b880d83647c5e3ca0
font_02_sfnt_off000135cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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