Malicious PDF — malware analysis report

Static analysis result for SHA-256 79eb846f56f1696c…

MALICIOUS

PDF

99.5 KB Created: 2021-08-01 20:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df08f8adf1ef49893ed7e0dea677221 SHA-1: 7a5f3f5053c4b5124ccdbb1944edc4f2b0e99a9c SHA-256: 79eb846f56f1696cec895bb5f1f4da654937b6b0c32e94c8cfb87a8a474a3e1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a payload or phish for credentials under the guise of software downloads. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb06aa97b---91335638.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/konuwoworanorojada.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c666e434137---68772610416.pdf
    • http://48bulls.com/js/upload/files/67015263169.pdf
    • http://alimentosldm.com/userfiles/file/mikomolosowebarovusuviga.pdf
    • http://sanders-scottfamily.com/clients/26926/File/vumamawivebixizunapir.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33654eef47---figagojigeze.pdf
    • http://businessvaluationapp.com//fck_files/file/vuvidupeponegedot.pdf
    • https://termofriz.rs//files/mivojovisele.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5245d1b4d---videtibotaxopibima.pdf
    • http://capmar.eu/userfiles/file/bipepijo.pdf
    • http://remont-elektro.eu/archiv/file/11520699670.pdf
    • http://www.asslar.de/downloads/56169756026.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bda7421bc44c5835e4eeecfde7ec8bd/59711588654.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774be18cefd---60720814489.pdf
    • http://4seasonstours.in/userfiles/file/nojiwunotamotegav.pdf
    • https://cupanghitam.com/contents//files/8025539173.pdf
    • http://bhk-aindling.com/userfiles/files/10012296088.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160938a42d2bfe---44287294983.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/4030711628.pdf
    • https://dla-pracownika.pl/pliki_user/File/dafiju.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/ripitirupaxotoruligowume.pdf
    • http://accessiblevehicleservices.com/userfiles/file/wikivevorokowe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+autodesk+maya+2014+full+version+with+crack
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f503.bin
c9c47e331d1fcc621ac027e42f0a667fd8deb8a20f9270d774c93dc3ac753c33
pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 8828 bytes
font_01_sfnt_off000111b7.bin
f06d4b516da4a93dd57b3c6121fb984903dea58a543b9f7849750afd9f3b28e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 22492 bytes
font_02_sfnt_off00014b1b.bin
2e092d8e5d793a26c0387f7b924f9cdc2042e9be839204fa9763e5d86bff2ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1B 11572 bytes
font_03_sfnt_off000166a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x166A3 16792 bytes