Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4ca0f3afb52bad…

MALICIOUS

PDF

77.3 KB Created: 2021-08-10 07:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21ea3bf39e0acd32777d3e0db47408ff SHA-1: 21e28d945959e920d17bffa350e87f68a0f3c03d SHA-256: 5b4ca0f3afb52badf3fe1501d611d6fec33e82b0a65d7af6944bbe4b1428696b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites, and the ML classifier strongly flags it as malicious. The presence of embedded JavaScript suggests an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735c86c56b---vobuvofejivumuxoxaduragar.pdf In PDF document text
    • http://synowka.pl/galeria/file/luwubaz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b908558a74---tawubevilunore.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3ca483db5407b0edb8e28d541bb381f5/medopow.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608725d4a19ef---diledalogarigogoleg.pdfIn PDF document text
    • http://info56.ru/userfiles/file/83193181982.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a796c6555ec---99895352236.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/fimunugiw.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/77226932339.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/vuxakoraxavewilod.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/sariv.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/xenakawevukorenofe.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6ca2de10---tuxezufi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6985e20a1a---gobenudafebafap.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/bg12o1sk2scom5cnrfbe5d9p51/kimutedowop.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858adf5c399---papagobimudewevozafe.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/dosilukopepopi.pdfIn PDF document text
    • http://lagrupacio.cat/file/gopufugigutu.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/3280419353.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tukiwavejidovedemazijadi.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/biwefepabolisixegumafev.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/retibosanivekekot.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9412b33b0---10679444576.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/74202278870.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/70171753587.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/94956333712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=formacion+civica+y+etica+tercer+grado+primaria+actividadesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 10968 bytes
SHA-256: f338b48b3d4dddececd240ee79681d122f7f1a998ce98d9d53f799bfec788086
font_02_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 16488 bytes
SHA-256: 9b8ee66603e7368c80b7edc578ab8d290e94ac88dbaad89a7e04c312e31f71bb

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