Malicious PDF — malware analysis report

Static analysis result for SHA-256 161a791af55a1cf6…

MALICIOUS

PDF

100.2 KB Created: 2021-07-20 12:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d44a37cd2fbf1524b26be43ac38cc107 SHA-1: fe2e1e534b134f2554c39e47f6aeb1fe9873f6dd SHA-256: 161a791af55a1cf6d244881d80ea6a561ea6594294d43cf9fe83010b125b56a6
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05172abaa---govefolurisowakizuramexo.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2c1666f2050092e423eeaba712922d00/wenupagamazamumizim.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/58673729269.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/95037133085.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vopuwagoror.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/49756781448.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/m34u1aq1ul9ae5h5aska3dak75/62140305669.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b59c1e25722627b30f9c0e27c225bfbe/mopegava.pdfIn PDF document text
    • http://balone.net/_upload/file///43751740769.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e2e80457920863983f15967cae7b3f74/gipetavexipo.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/nebefedixagatu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c340c4da4---delanewamufome.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b47abacd950e59e3c767fb431d52f3e4/nasijezem.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc9e94c7e---birirowej.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608017ed1238d---40863421045.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/35792579147.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/bf1a3b0482d3ecec07f6c4cbf8e4ff6b/28146278218.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/45ki92lk6r03icmd1ghsf80ab0/rexafa.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/53026998203.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e3b5b3c1990495dfd7e3a08e1054aac0/16539577156.pdfIn macro / runtime command snippet
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e374ulm1uu3en231254999130/76194539887.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/xewigesanavawiza.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/fijovagafovalat.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=find+the+square+root+ofPDF 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_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC8 17920 bytes
SHA-256: aa2fb599ccc5dce837b381263a2afaff746eb2f6a572ab9d4ded0a2f101715f8
font_02_sfnt_off00016a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A29 10628 bytes
SHA-256: b36050ff6772ff3608db98e11fb8037d3c8efd892d99c265854a56dd7a84ab88

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