Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e747762091114e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 11:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45af8d3f3ded5955a02a2ca2ff9c5d91 SHA-1: 4ce6b1d40a40021edb6e69c65de99c3b8cd82dfa SHA-256: b3e747762091114e58299ca0a7583da9f86332c23a9b4e0dbee1db03d63861e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://musicpark-live.com/userfiles/file/87918511765.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff07112bee---muwawizumeneruno.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/mufuvavofebutok.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rc7a0788bbdabsbb8h6f6isk9q/49109536160.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nupireximibobozabut.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/diroxiwogi.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/rixobepaki.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/93ca98f750ae5e763c52425234cceb7d/tatekebanom.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/73022090575.pdfIn PDF document text
    • https://digireg.li/upload/xilusegimasemuli.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904040350.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/91611450941.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/70534138754.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pibon.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/badupiselunojuzejikojoxux.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/98736595150.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/98805399436.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24c6cafe6---7622030667.pdfIn PDF document text
    • http://jsdarvin.com/files/makomakit.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vaxinefirimadumaviwoxi.pdfIn PDF document text
    • https://norservis.info/files/files/72762202324.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xinujenivefitopaga.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/85170407636.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/83868626689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=technewztop+app+download+apk+downloadPDF 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 10452 bytes
SHA-256: a4bea5f15be1549395ed54717fb001e78db17c29fe3c80bf56663ccaec398018
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 17084 bytes
SHA-256: bcf3ded13eb0ff38f6772c266b83198f044fed0e2c0fc7c1e10e9c00d771eeed
font_02_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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