Malicious PDF — malware analysis report

Static analysis result for SHA-256 0279be146d566760…

MALICIOUS

PDF

85.4 KB Created: 2021-07-18 04:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4793c504e54082218db6a0dc49c6b13f SHA-1: 9c9c8527e7c33299de3e3c5728c7cf18a02488a3 SHA-256: 0279be146d566760d4717afb20a2b102468b66f5fe7407aaafca1715cd1b5e68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://algeos.us/js/ckfinder/userfiles/files/kuzixiwokimofuzen.pdf
    • https://taksis.lv/taksis/userfiles/file/98257036774.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m3sau4mkc8tvoe1j2v1mrjqrhl/13686825406.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2df086ca2b3d0184adc8e723f02b2736/zunolula.pdf
    • https://coastalstudio.com/images/main/file/memugasofikeziripa.pdf
    • http://amdind.com/userfiles/file/botojowuxapafaw.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280165f207---14763081864.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78198e3a74---tikobulorolej.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7n5pdl6n8se9io37lcrirndmn2/riwiludijewebizuzena.pdf
    • http://botosani.ro/img/uploads/file/gojusaz.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/90279572368.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec95d45a67---tunezaka.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/52523381842.pdf
    • http://zonweringbelgie.be/ckfinder/userfiles/files/mujupu.pdf
    • https://numberonerevolution.it/file/98136220181.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c79800c53---76113225727.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1746e726f---dozapi.pdf
    • http://makesomenoise.hu/upload/file/xinazilubamekaderelivosi.pdf
    • http://aivieksteslaivas.lv/userfiles/file/50316497683.pdf
    • http://pnmanagementsolutions.in/uploads/zurikezotor.pdf
    • https://aplusadvance.com/naver_editor/data/file/gidofafixanelis.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5105006cf---xadukuwozimolafimuvolaso.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160804f0164520---65843284694.pdf
    • http://gtshotel.it/images/file/20406544736.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f451bfe461c8626e283631b498b281b2/garituvimasonijonojimajek.pdf
    • http://dogninja.com/userfiles/files/kidugigitizozazexemobu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=notice+to+vacate+month+to+month+lease+victoria
    • 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_off0000ec0b.bin
c9c96ddec10c4fb6b6ae4fd9071ef7c538665cfe60f19fad026b09c77b557918
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 10540 bytes
font_01_sfnt_off000103d9.bin
2c62c639ddfb2ebbb4a438361350aafc9d6b9294312ad8ff5af82c18e7aa1bee
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 16980 bytes
font_02_sfnt_off00012fe4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes