Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa38d3f81e3bd1d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 03:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7a20bc9f9832de0439cb2adbc3d03e5c SHA-1: 92c7468e3f2ef5c60bf3aab087c29a11afb1c7e2 SHA-256: efa38d3f81e3bd1decea1fbe62bd8f3efcc01735ed56eaf2c6421f11c2a80a6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to link farms on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bhk-aindling.com/userfiles/files/vijopivopedonogufetubizex.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/torobevagepigawezapud.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161336b8482e34---68984948569.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/relonufox.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d9aad4b1---48197372045.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tojoxoxedibolo.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/gobodirufik.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109051230026179.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/tawadixajez.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/13581952694.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/rokizewafafazoga.pdfIn PDF document text
    • http://cityfate.com/files/files/11353051065.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/zurorowesebamakezog.pdfIn PDF document text
    • http://acril.ru/ufiles/files/62232710530.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/39024402383.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/93b1c3d08a70538306510724789f3a0d/sujotisawujejolab.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/bufarexofukefelurigula.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/26906989419.pdfIn PDF document text
    • http://myphamasia.net/upload/files/sifemapiwejepezijaxujig.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/79688572316.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/30568485912.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/retijubunoxigunowow.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/tolosijivemaxikotu.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/32251467660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=feres+driver+app+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_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 10416 bytes
SHA-256: 3c08ca0a4a6ecb40a7ba52b9ed9be7f05011a88f6836cf883a5bfbd8e01503d7
font_01_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 17456 bytes
SHA-256: 64555dc4c0b00168396a3fef8ce1559693b1b99f14291ef79e74a3b5ce892714

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