Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad2423cdc0c98c6…

MALICIOUS

PDF

78.8 KB Created: 2021-06-26 02:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 174f427b96a7e6cbc89cabd9bdc64fce SHA-1: 4969566355783af929987591051df7e7d11e459e SHA-256: 5ad2423cdc0c98c607724a3e7330b8c692517b599ec6504a6b1470bf6d3e39c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm directing users to multiple compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://motoquadro.de/userfiles/file/1392343306.pdf
    • https://ntiverification.com/userfiles/file/82731078672.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/666c3k2s3t9jjjdriihlm35g02/norujufodemexexozo.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e72f33c009---tilasigipofurimiwas.pdf
    • http://tahi.hu/ckfinder/userfiles/files/vogikugaviruno.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/j41bqei98ojg0s860lu0flvbv4/boxavikumopinemifo.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf35b07498---kuwexulanefole.pdf
    • http://zkojicin.cz/userfiles/file/20736111991.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607badf077896---15785785625.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/93652732601.pdf
    • http://absolutelyneon.com/userfiles/file/35005850850.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/270cbab4ae83f6b0557747470d13bb05/lupofamikezenexozukeju.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddc8c78db---juragibemagupexugiru.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795a4828bb---miridegis.pdf
    • http://wooshin.kr/uploaded/file/1976375659609dada9dfc19.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b88c7ca8ac0---wuvinemurewipevi.pdf
    • http://dgjst.com/upfile/file/xifufasaliw.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722186656c7---90747575698.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5426c8f34---nakafome.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c15fcb77e33f07325ca767c08062dee9/fedubiwazumiremunoruzagef.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fe90ef0a---nemezako.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160907346b320b---45479992137.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/473mq1mva6lpdf5u14k3cpv6b5/pafafebutakewevimaki.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kul1qjg1pnfddg8bmojeknl7r0/bokenusoxigaxixedepe.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e457e542---63492408391.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4ef53d4211d3c4b4aae6e2c15a30e990/46534775131.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6970b2e44---popoga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=you+can+fly+away
    • 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_off0000d24c.bin
6d1b197958ec89332242582ddaeeac380a0cc0c8dfeeb3e1a6f66741b756c6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 17640 bytes
font_01_sfnt_off0000ffa6.bin
038d795401a7a9579dbdb8ab4e5101e1336fa7a9feddebc6a969d1b164aa8ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 10024 bytes
font_02_sfnt_off00011614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 16792 bytes

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