Malicious PDF — malware analysis report

Static analysis result for SHA-256 4784c5f5efa54c4d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 14:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47ae5414bb3756557b1e737ab12749b5 SHA-1: 53446ecc0f06659c7a6100749a141ac3ff8bbd46 SHA-256: 4784c5f5efa54c4de797bd792ec97b918bc988212058290a7ab18fb5b06306f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious content or phishing pages through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.idd.no/ckfinder/userfiles/files/madawunowom.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161351f7688843---foxafotapijikededifi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/pemereligodepetazukimagi.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/fugoxigenu.pdfIn PDF document text
    • http://all-premium.com/user_file/files/68949572047.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/72779131010.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/tevedufesezofopabokotite.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3b3b38a1---jofexamozexolofobogobemug.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9406e8077---benexikore.pdfIn PDF document text
    • http://coffee33.ru/archive/file/35433315390.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/77810179766.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/31646079570.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xipegibomogapurebire.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/poruvadupi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/47357064711.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9d6c47c0---watowijesewufimagonow.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210904_CF96D13935B042BD.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lewugozegejevulodakesofu.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/xodusavewokametagojozigem.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/94946665218.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/8033882001.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/mibipuruwomavejukimuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+lightsaber+stylePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/figatajizejedud.pdfIn PDF document text
    • 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_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 10472 bytes
SHA-256: f6e209ef4aa694533e8f246c1dbb46e34ea18203b71e55c85d7a5cd66da69989
font_02_sfnt_off00011703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 18080 bytes
SHA-256: 3911d17b50ac24c670ac1a3dd88edd9b62266fe524e48b150abb73abbc518b38

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