Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef47581cba4377f…

MALICIOUS

PDF

77.0 KB Created: 2021-07-02 02:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22b5943d5fefe518306ace282d37991b SHA-1: 04cdea6401f90b9c223454805007aaa750db37df SHA-256: fef47581cba4377f514710f72669aae8aa3e00d35cb47f7dbc975d88a067630e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d7dd91f0---1955556465.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/134b8fd94aec3e2d6eb96440ad248540/makopipenokurobuwevonapaz.pdf
    • https://facades-metal.ch/ckfinder/userfiles/files/vunavo.pdf
    • https://associazionedynamica.it/uploads/file/78210263283.pdf
    • http://camwater.org/media/files/vepegelupusarubud.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2607430c5fb20da57c61d368712699c1/nimapilafulegebodowanib.pdf
    • https://edusfera.pl/upload/file/fobodokorevirun.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6feed3aa0e815d3a10c06849c8b7a3f2/23573093792.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/wikokes.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a936d33b3e---85342702297.pdf
    • https://myphi.biz/nbloom/fckuploads/file/83630829898.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o5osoqj7avqna9coir3gng7t72/veserad.pdf
    • http://africa-emergence2019.com/userfiles/file/70992027485.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/54b1799fa8e840bd88898037393cc53f/41900915350.pdf
    • https://gizaviation.com/uploads/files/jisuvasibudelafowekesaji.pdf
    • http://tai-group.com/upload/files/53532724430.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4424cccd6181f31ab0421d640461da17/xumusuge.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e184d2e4---vutugakatobopupijunerajo.pdf
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/12534385221.pdf
    • http://allg-gyn.ch/userfiles/file/zituwoviw.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/gebifuj.pdf
    • http://bi-acaovo.com/upload/files/28386134143.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac923c31c4---80898639463.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=convert+scanned+document+to+searchable+pdf
    • 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_off0000c916.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC916 16792 bytes
font_01_sfnt_off0000e12d.bin
3c3fa6918290f398b6c2d2f84d87ee388604961db978fa5d46b43f05d8279b89
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 11132 bytes
font_02_sfnt_off0000fad0.bin
f247f747105af88de9c6b90031f0787c36430bd9e517fe6992aeb9d4328f4b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 17168 bytes