Malicious PDF — malware analysis report

Static analysis result for SHA-256 32683250e022e86d…

MALICIOUS

PDF

92.9 KB Created: 2021-07-23 08:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34561cb61ef15b95e2ede7606dbe8a2e SHA-1: 3a35e06bfef6137daa1238e9073c0d27f47a801a SHA-256: 32683250e022e86da0e40be4c48ec0b38452666bbb8b0a5e97e0ecb8092e99b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8vk8nt31lshkb0mg8u3tn080j5/raxomawogovusixovalujus.pdf In PDF document text
    • https://daquin-ferriere.fr/userfiles/file/gojutadoze.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224a8e134d---jesevetewigamawamo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89eace8f88---zupubaxutiwamuve.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbeffb11c1---xejelo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dba713bd1e6---72764027524.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596066e20b---57623277550.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f9be2751---sefisor.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2a5c20f3---17043292564.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/numuxogokotukim.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/16883858980.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/jekomemawesekokazabe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hmduum1kqpidmj6l6sjvs1hqc1/nizukikekodulak.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160879106a82ee---bomigoziwe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160876e6192feb---vanibofi.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/14895939416.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/51747082cb14ae859007c07a42e76406/koredosuwozisigekivuvunem.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/abb5d558c25674b86a90abbc68272973/30868509260.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6gpp01sdcb94bavuvou9a16o46/47941658875.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/39696939996.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062314564497.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/7790695213.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/takixarevubumirumakorewi.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/95817650107.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2803a4c376622b5e03e1f7861b1d45ac/14189083607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apk+rollercoaster+tycoon+classicPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 24380 bytes
SHA-256: 4bf97a17a47d066b2be9981787fa04b6e622cf7770c456bc5c73814c7ab1cec7
font_01_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 2352 bytes
SHA-256: 2b0c757cf6a5dca64e4cae8c45b03ccdfb9499f0b48676fa5ce4ef25d338ce8b
font_02_sfnt_off00013339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B50 10556 bytes
SHA-256: 79083fc1cf54b739100c0d2a0859d7de1f3630eb58a01d98d2117390e3f611b5