Malicious PDF — malware analysis report

Static analysis result for SHA-256 d975bc8783e2c58b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-01 00:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb8741c267ed3926d1ff46025a658d82 SHA-1: fec735fc0ec1b7bfce5b992c98f0405f24ccdcac SHA-256: d975bc8783e2c58b3d4fdb3c1fd0dac5f31cb54c73a972fd169b47a95d5f2ca7
154 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The document's structure as a link farm suggests it is part of a broader phishing campaign, with the initial delivery vector likely being a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6473

Heuristics 5

  • 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
  • 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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68384deea---37589877401.pdf In PDF document text
    • http://sziazsauto.com/uploads/files/wefimifugunoba.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/senitomebazoguxar.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lgf7ajhldv3bt2pen2a4bl5gn2/29844304265.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/20093165877.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d797ea4f4128971511e8edb45cedee34/67739045895.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/86285650742.pdfIn PDF document text
    • http://grimastone.ru/files/88692443003.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/67864841402.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/l8impcpoc02i72fnqjqp3bl3vu/duwadivakiwefexuxolux.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610c824e82350---21031722289.pdfIn PDF document text
    • https://energooptima.hu/upload/File/13809450551.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/4056259789.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff0bd693a---56635221168.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/sevodoxorukamasaxexemu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7ca0d0f0b05663c8608ba0b585be1ab8/pevawes.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0615f95d7404f962d30f9080e549e374/fupojow.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/woxoza.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210820_441B67A299494F38.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/nuxamokiwelavased.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/buzujalusafo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b53c1841cf3---dimamima.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/42271839443.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/wiresalewupolitilarilu.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/dumeretaw.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/41cde2303730482a0cbea5814ffbf245/49410329141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=definition+of+like+fractionsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1