Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57f78012fd30cb6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-20 03:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5b46302bdfedc75c361ef2a38668cbbe SHA-1: 251e20d2015359bd6c866ee221dec5b4086999ca SHA-256: e57f78012fd30cb688d0994928c603753488561f23a0172a9f268b1ffcb9f507
164 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 executing malicious code. It also features a link farm pointing to compromised WordPress upload directories and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bilalyapidekorasyon.com/userfiles/file/zilivekisi.pdf In PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/77806557276.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/38260881392.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/ditusejelupanumazuxetuzu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6094f562---4840497288.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/8581619580.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b2c644b86b8196e401f1b6e801767cc1/57308983605.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614515cf4d320---suzuliwi.pdfIn PDF document text
    • http://artospace.com/pics/file/89485709409.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/duvawomesalogukugoze.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/musuba.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/roledejafowezadufabuwo.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/53850083989.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/65070409452.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/jetoduweromosamazegika.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/47820921743.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/jazabojefojepep.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a1626e3e70e9e724affe808c692f608e/57288474976.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/20213781163.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/todejukil.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/baxele.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/223949081.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/99322020721.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/36837187082.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/buzekip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+peach+emojiPDF 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_off0000b317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 10576 bytes
SHA-256: 17bdb26f3623707fd0546532bf2ae1de3dc333ad07088f97cf6ecf7502172c61
font_02_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 14888 bytes
SHA-256: 28c7d4bbe64f4ceedcdbf702a130f03b589a8ce846f6fb0aed65cce885241ee3