Malicious PDF — malware analysis report

Static analysis result for SHA-256 588265e7c3840e7d…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 01:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de9c29049f2e64ba7a5ca5e4a3567e79 SHA-1: 859403d5cd661ff4ccbc2eeebdf6ba6be8db4bcf SHA-256: 588265e7c3840e7d2dbef29f8c2174cba87fe9ea9dace3e3dba2dff80355f19c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=letter+m+fonts+copy+and+paste PDF link annotation
    • https://hohsingfiber.com/ufiles/files/rusovim.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/42154507483.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/77291037704.pdfIn PDF document text
    • http://all-premium.com/user_file/files/saxudoriwaki.pdfIn PDF document text
    • http://juncheng.tw/upload/files/jibomogegaretubewejin.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02ae9880a---28648695123.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16130061fba237---18572142045.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/94409312059.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/rerojoxumefajelesefatatuw.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zilutavuravasuvugelilo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ppljb1362klbj460d8982lhhsj/20990856140.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/pokut.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/figake.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/2432888102.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/tasubiwelarevaneboje.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wopudasonojegudofo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/99654419715.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/17167487916.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/jileze.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382b42dfd34---98052608248.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd1764933---kijefifegezo.pdfIn PDF document text
    • http://viorina-deko.com/images/file/jogejumesubeworulowomudu.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/9059669496.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/zovarobunu.pdfIn PDF document text
    • 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 23296 bytes
SHA-256: e1148a1178ef3a59e51537f233d812a7a149374f8a11744bd1d338a091135d9e
font_01_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 10716 bytes
SHA-256: 363d910973bde9778ffddcdbe276c647fe2083ce2fea2a5e7bf90cba3f87751d
font_02_sfnt_off0001387a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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