Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d572a7642d4424…

MALICIOUS

PDF

75.7 KB Created: 2021-09-25 13:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 567e7ed2e6f453ee9e1bd6605b1b64b6 SHA-1: 8a2c543770851087b482055943524d0a2d94d2b8 SHA-256: a4d572a7642d4424c8d7515ad626c35158b81705f8727edcb704ec634e2b66fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, forming link farms. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://menokatea.in/ckfinder/userfiles/files/93688329218.pdf In PDF document text
    • https://dnm.tw/uploads/files/202109241105394656.pdfIn PDF document text
    • http://evola.it/userfiles/files/xulumapirigolekobopuwezib.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad2a3e767---32095744629.pdfIn PDF document text
    • http://hexindechem.com/upload/files/rafobunexajego.pdfIn PDF document text
    • http://benrassam.com/uploads/files/vakezatusuwetekuzileze.pdfIn PDF document text
    • https://triosms.com/userfiles/file/bevalelizusofavezu.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/lovarozi.pdfIn PDF document text
    • http://birdwatching.sk/media/file/wezimanigumim.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/33210408594.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/mutalebimalijukofulu.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/xuboxisuvo.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/xateginitiz.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/madulixat.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/pikapunesiderizuda.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88b1d5560---64821970676.pdfIn PDF document text
    • http://etkenkalip.com/files/rodawezidelelo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rdasm2kg5lnoou2r9r2jgh1g3g/30041203371.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/zajejevafikojiwenemipurud.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/palafomex.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-18/20210918115710306019.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/87271805830.pdfIn PDF document text
    • http://fabtur.ru/upload/files/piwegapagitodobev.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/nutokabo.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/49352535017.pdfIn PDF document text
    • https://10fci.org/userfiles/file/72320944409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hungry+shark+hack+apk+free+downloadPDF 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_off0000be6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6D 19044 bytes
SHA-256: 15e23d80cc8656b1bea3bdf7e30f1c6e1523fd895c0df29b6feb1f15f6f2cbc9
font_01_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 11092 bytes
SHA-256: e4ef4132a1df2c5eb36745e5506feab7216cabe19bae04887bf8b6588b2e6e42