Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb500f7d6131f2e2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 03:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d12289ee0a5a876d6c8d59faddbc30a SHA-1: e8ece74d257a0e7dd96596591e9e019b426824db SHA-256: eb500f7d6131f2e227730112f7734a6353a622df5be79235606d2044e57d103a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many of which point to PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript could be used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5s9m6p1ruvd29bl69gcmj9dhfl/besube.pdf In PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/tisemagimozizosevipadena.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/80551160058.pdfIn PDF document text
    • https://energooptima.hu/upload/File/87693516141.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/wusuvaba.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/sibozepirovaxuzinuvirasuj.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/keramiwiraloxebawufogud.pdfIn PDF document text
    • http://popmetre.com/news/files/ruxokowiwi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebd22dbb3---zolibesuxonoz.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/632c9a54dcf10258f1046016c0ce52f3/xuresugilabiter.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/fepujibeduxavifa.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/51777780371.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5dkfghbrvptkhi6bsp2v10rp4l/juxidetelakamavawijanode.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa25a5adf---29042500777.pdfIn PDF document text
    • https://laser123.com/geektic/files/mabul.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7432568e---kekeroguwidowigusilegawi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abde4e6f906---wurufetibalaretuvew.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/22541666691.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/24333302905.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d11cdb8e---pafesibajibere.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/79196816025.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/20789230416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pasqually%27s+pizza+%26+wingsPDF 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_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 17696 bytes
SHA-256: fcc796d1639858942d6f3da93f367fb5915f06399f6713fdbe0d2b4df68c5947
font_01_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 10144 bytes
SHA-256: 8991f3f15f4abd093ddadd121a6bf28d3a8d863cb74e6abde1e35d5b1d80e153
font_02_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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