Malicious PDF — malware analysis report

Static analysis result for SHA-256 2424607afb852599…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 07:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e96cb8139c46d5967f20c160fdb8f231 SHA-1: bd00cd259a0bea9d921187444fcc4092340f0704 SHA-256: 2424607afb8525999f8dee06517373c71bed995da260e4b2eab8298bcb44f3c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised websites. The presence of multiple PDF files hosted on these compromised sites suggests an attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://apz-arte.com/ckfinder/userfiles/files/26719019149.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614876cf6a078---volisoni.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c71cae2f29---74735241813.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/tamafamidekasalanibeka.pdfIn PDF document text
    • https://actorconseil.com/files/file/kevilu.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/94816617073.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/25412443591.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6d6868192---fomubuxowozak.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/dazukeweniwokinisuzuwos.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133260abcaab---58806988926.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/50616620433.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/sizuwag.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/datapefituzajiraka.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/givasaw.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nejogowomizuposaxe.pdfIn PDF document text
    • https://attack.lt/images/files/52836919342.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/21692802262.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/90385466560.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/125aa43869e3352656cba02a2bbd4be6/13278696356.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ccb53c824f61089500ca49ddf58d3ce4/4932349288.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210916_ABBCB1CA7478E43E.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/gotoxenaxitevizomozuxe.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/14120543000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+cinema+hd+firestickPDF 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_off0000af73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 10920 bytes
SHA-256: db90b8aba51711893adab9f11f7843eb5dec71346133d5ed219c7f22466810f2
font_02_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 14372 bytes
SHA-256: 4a27af7769916772aaffdb15e3bab42913d6455df0eeea8373f7d4781f9f52f1
font_03_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 17692 bytes
SHA-256: 33ad4a4a7b23f617b7396dc9f79b997a3072c1aa665d7d0dc1c23c1f5ec25f8b

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