Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2383bdeb1cac8d4…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 10:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e144f444fec32d3343878e4b13f7e7a0 SHA-1: 3bb0c15c394fa4b304878aaef886efdb08ded39d SHA-256: e2383bdeb1cac8d48d3a49c3251b406780a6f55909b43ccaa7e69ca73403ee90
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as lures to phishing pages or malware download sites.

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 http://thebankcardservices.com/uploads/files/dolora.pdf In PDF document text
    • http://saluteebenesseresas.it/userfiles/files/50658696212.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613689dadc193---16061103241.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011150569131.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/votefigaseboka.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48692723260.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/dozozofukituxaderovapar.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/50686766805.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/duxazaduv.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/98635473126.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/16134108360.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/7094651316.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wajevuvafigulib.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/01/gugaduzegi.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/32668290638.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcbc6dbf1---xefuwumurage.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/j69r1he3otmmu56td9jius19jt/dolaritetukidelabeniro.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161355985a0ae3---94887730915.pdfIn PDF document text
    • https://clubon.top/uploads/files/nogusobil.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/44647053987.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/79340350078.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nipusibevosukotog.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/16852191438.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/dusewarijadezotofa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/aqi4dqi31m7pco8s25lndpjgnk/wosinagodukon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+ir+remote+apiPDF 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_off0000b6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 16868 bytes
SHA-256: d4dd9cc685664a30ae0985144e4a7d9e2c0be2cef650534447ab9ba6e9c4b424
font_02_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 10320 bytes
SHA-256: 0c8bfdf4490f31bce7a2b88b080e6cf7c50bb7175d9f618dd52be2fe01f42297

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