Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1adb02797c8db8a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 11:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3a20614ccd7ad0753e1a838785b0446 SHA-1: 107c7347af09139b163ef1e8df3c7bcaad3226e4 SHA-256: c1adb02797c8db8a2fc12d6efc09a4a4b2625c724479f94857a00053835ed3a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including one pointing to a raw IP address, indicating a likely attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous URI heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cukorbetegshop.hu/files/tifuwudefowapevimanolepo.pdf
    • http://metabolit-plus.ru/files/file/2945002501.pdf
    • http://mariopresto.pl/userfiles/file/93071883171.pdf
    • https://grandiosieventinuziali.it/filesUploads/file/43299583196.pdf
    • https://democv.associasuite.com/imagenes/contenidos/files/73871209395.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pidajewemoratekugaxidosi.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139f87f239b6---lukokatetubaronakir.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/legumoduvotipolajo.pdf
    • http://fmmvn.net/userfiles/files/80344794513.pdf
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/vajiburupuz.pdf
    • https://n-vv.dk/userfiles/file/risoju.pdf
    • http://saluteebenesseresas.it/userfiles/files/46167423230.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137604501629---gitezoxite.pdf
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/retorerupopatimiwanu.pdf
    • https://baobiachau.com/luutru/files/ritutalatix.pdf
    • https://cplastik.cz/data/cms/file/muvewuzitozesejepedasojo.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/82863608220.pdf
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/renazof.pdf
    • http://www.pranabkumar.com/fckimages/file/senidukitusukasivevemiga.pdf
    • http://studio-castiglioni.com/userfiles/files/wozujigipolefaretu.pdf
    • https://aneri12.eu/res/file/giwes.pdf
    • http://koddous.com/userfiles/file/fiwogure.pdf
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/dasodiboxujaw.pdf
    • http://sacoorhealth.pt/site/upload/file/wutemipagini.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=brookhaven+music+codes+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afb2.bin
57c0925d7ec9df57ffb109883a7ce34e3c40d3e0774b0a0b70c5b5e5dc3f05ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB2 15212 bytes
font_01_sfnt_off0000d657.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 16792 bytes
font_02_sfnt_off0000ee6e.bin
fda791f84695954e35ee531f02dcb7f4b167c0755e3d986db6e1bacbfbca1fa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 11096 bytes