Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e0df63e226eb9b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 19:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43b3279a53db4959e44b4f3354224634 SHA-1: bfad392fa88c48f50eeba2d4966e5351152770c4 SHA-256: 78e0df63e226eb9bbd743c03e1d74579e7a5456234df0cf7c2a4c30e8dbb70b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://vandervalk.reviews/app/webroot/files/userfiles/files/fanixeres.pdf In PDF document text
    • https://jager-ig.tw/up_photo/file/9488013398.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xivijapagugogepas.pdfIn PDF document text
    • https://estoniapools.com/contents/files/65422097790.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/jujifene.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/demoson.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/jiwukixiwakixenizutugow.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/17899837125.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd14385b61---36991738161.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9c8f872e8c7b14aa0b370aedba388386/lugerutorijixelawikor.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ec50bf0a02f5713cfb356d07935ccb86/50870925085.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/duwikizoxa.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/matotewezege.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161424b890416a---zumiwexavelipet.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/lubufubesuf.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc1bdb3e1---8804043875.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/1201607262.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/14621934188.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908080648_4yf7nx.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/tuzizagukaguvukib.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/rawuwoxuturexudijeb.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/50394115811.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/27265888693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chrome+os+launcher+apkPDF 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_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 10672 bytes
SHA-256: ee01ebcc5dde89e0d9298dba4c2287a64332bd35d21f36112618ae924f5c24bd
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 17124 bytes
SHA-256: c3d2920524cf4db30414238c6fc33335aad2ce40a5e94825106cdeea1d4958cf