Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e20aa64adf6e19…

MALICIOUS

PDF

91.2 KB Created: 2021-07-04 01:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c31366c4f25d94607d5127f5e1c02f18 SHA-1: dd06d4339f3c0cad2270c8c10bf863fb3864bc31 SHA-256: 50e20aa64adf6e198f0c3b007771aafb43b6272b067698c439266220f7d27193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The presence of multiple compromised CMS upload links suggests an attempt to host or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5279abb89---mimuduxomurolipenujap.pdf
    • http://szao-spb.ru/images/news/file/36262335345.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b8165871d11a21dfe22e734edb42c2ea/65791895840.pdf
    • https://liderpin.com/calisma2/files/uploads/86189521551.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/65189087782.pdf
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/gomajaninuritanajilaxim.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc64ee5a92---dewewiboro.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d86616f64---18524321463.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088336fb00e0---91875444823.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5dde353257eccf64309caf80bd523fdc/43118408645.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jhqfrebcr64l735o8001fsi0pc/puregaxatixarined.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vvgth4aml6po56lv8037e6ojj4/pakokutapogorokifiv.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5822ec11c---xovugoxasafajibipufapa.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cb756d78d11376a85915e4e9f747a7c0/wovaxonuwezabu.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e43531d93---fonowalelavitasek.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/46807681075.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/retekakenijagoxoladub.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073455f8c660---54135555904.pdf
    • http://seabeachthailand.com/UserFiles/file/14470122423.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606da566dbaef---3479056994.pdf
    • https://pharma-tools.eu/galeria/file/jedekozolikojexitabegi.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/31596690957.pdf
    • http://slsnn.ru/content/file/xifijasu.pdf
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/d06705ed49aeaf5a1f734ac7efce3484/15448414939.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=biblical+youth+empowerment
    • 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_off00010085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 16792 bytes
font_01_sfnt_off0001189c.bin
633bdf6e03651b96d38bb3f75a5a43a5cbdd6dd57b6187d13850513e09910a93
pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 10964 bytes
font_02_sfnt_off000131ba.bin
792c9dbfb07d99af5b4c1c37f35e23ec9a04147c98915654908bac9676dc9520
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 17128 bytes