Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0b7882efd04508…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 13:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10f86d0b7f53ed613d63f3b5acf84518 SHA-1: 7fca1580f2e51a1f634e5b94e776b832f8743af0 SHA-256: 9a0b7882efd0450829d74b7294f5949a51c25b6015319deb0d5292f80eee0b59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple links pointing to compromised WordPress sites and disposable hosting suggests a link farm intended to obscure the ultimate destination, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://biotop-zamosc.pl/userfiles/file/fuxezenoruvadokuweg.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1e436e1c10502824b7e0906ba343de13/99680219942.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/zivanadevapipenogumiton.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/013d66f23f3fc44f4b13d66314c1a8c3/kerupix.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607482bd46c2e---16412357667.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/84948499835.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862484be427---27552877664.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108240744406929.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/beriwekivufaponejej.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/defariloxafemasajudunepel.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/jupifesenufewu.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/62655173466.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5a3ea87cf875e7ff8dc3cc61f267df0b/90690941878.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/39540381059.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/30816537209.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/91839717325.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af7d75f6d---fipugiz.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/fisijuwipogitiwasidewoda.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/vipanogat.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/2566802621.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/goregaxuseroxekuvulu.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56762764808.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/6562548779.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/31078531644.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/27591765469.pdfIn PDF document text
    • https://ahha.az/userfiles/file/67638479730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=boyle+charles+and+gay+lussac+law+worksheet+answer+keyPDF 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_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 11000 bytes
SHA-256: 8268ee6891fc169b68f3e7f314c457c154dcc8456a528dc2b69447a39db5afab
font_02_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16564 bytes
SHA-256: d5d2f866f9873df44719ed14157f88a22a572fd97c6d65f44c51f7438e83014d

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