Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ae6bf8fada4272…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 11:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90f34ec286bcc87ae8d75977cdc7f5e3 SHA-1: 81d8dfa36f28ef4a1f97c93c8aa982fcee9517a3 SHA-256: 00ae6bf8fada4272eac496b52b40b78efa4cbbaf56c869e386008db40c403996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the PDF's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=deities+and+demigods+ad%26d+pdf PDF link annotation
    • http://aire-limpio.com/img/editor/file/19433986518.pdfIn PDF document text
    • https://bio86.net/fichiers/25102291396.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/movoxa.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/galiv.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/iqot2e7hgbuis1oqqjvp9i9i2s/88359336430.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/28857340999.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095c4e1ba06d---xafinubijep.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gibajelexelar.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/4739826182.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098bde3897db---jazibujejogupe.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/llvanugojasvnuj4tn9rb0tif0/6490038719.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/fupifesodafagavasejiguv.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/77082826675.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/97168350963.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/nufamujixizibu.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/getuwuluderi.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/53534362922.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/ritutuwiboforidijofokadu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d1ca64ac4---98411291860.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7hq28k2aagl58fdcs3apk3tpo4/gititekuxukapa.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/28787512148.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712782d12b4---8273029458.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/tm4kpcaglqunn2uguln8m5tb41/favazorenajazak.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_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 19072 bytes
SHA-256: 11640e7e1dcb1de2845bbcbf6367216263b413467758c7cade5e10586df1a10a
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 10444 bytes
SHA-256: 2a63b51a0abbe3ce4fbee21308a5f66ecea4b1dc0b7dd9df17c1734856078d4a
font_02_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1