Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa85cc73fd930c4d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 06:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b7f42fff107d16c63ffaa1ebb26e6cc SHA-1: 52a5ccb5253687b48615a7f05502a44cfef043bf SHA-256: aa85cc73fd930c4dc2332d7ed924050367ea1201b2ccf3ef90b7cb5fcc7a18f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Additionally, the presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress installations, indicates a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/buzoforapolotafi.pdf In PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/e126a8e7005b634c6e0474f09aa1f61d/65733431183.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16089946c7b8bd---78418859320.pdfIn PDF document text
    • https://computerzone.pk/file/bidabisir.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210811221148917.pdfIn PDF document text
    • http://biosite.ru/images/news/file/29392915649.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/39983350672.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/viromarove.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/lidirupurofozalona.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/fijopifapigorukad.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4652534054---latefopotujolobodabumexob.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/pofoxefofolawitagijus.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8cc5964c5---dizatoluwesowi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f7f22cf6---badak.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202183069125592.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/47b23e7a5ba0de523f47b7c193048e15/pudukijupuzogapowasaxof.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/gumiwajetu.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/lezoxuvadevugemaxavetamij.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/lifeliribapuxoxivata.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/cubqret4lcolv0ds2u98454u8u/zemomunetidipepazo.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/30938495898.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0643d71bf---25896132896.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/bopegujuwevojaso.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e158602bf3df41a066396c7a51870810/dogobom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cost+to+build+a+multi+family+homePDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 17156 bytes
SHA-256: 9a87b773db3e1761cda026daadb9c54a9782ecf4126794991c8e92daa6d287e1
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 10800 bytes
SHA-256: 375b5f605d3b5f1cc70620cde609389c1ebddc1f0cadb37ef3e77f12ebe70050
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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