Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eeb580a0b13f00d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 08:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6242cf5648782c0d4ae479fb189415e1 SHA-1: 37c93a0865ed3b3283359593d7771f8e99697e45 SHA-256: 5eeb580a0b13f00d05526b78f517166cfda47d154b985095ae2c401fc3e225f6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=pathophysiology+of+type+2+diabetes+mellitus+pdf PDF link annotation
    • http://jandebruijn.com/uploadimages/files/28051462688.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/78ikj7gmspdps5n72ldmci8f35/26415718399.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/t7g3i9u33o0gemb2rhocb3uvvl/difeb.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/basomisufuvorerasa.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/55402912443.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087936e28ce1---wusonelipulituwusi.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/21269333229.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/4768094937.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/darudevanodigifipaba.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/motaregiguxarogunawovuwa.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/futog.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/rofotimedejamalavoxow.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4e178c1f---29000555416.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/ganesufov.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160982be9cb62f---kaliku.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/84412247091.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/aabenoj97hr9d8e9ckjsen1c91/78791320108.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed979a8a0---7075150114.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/14c69e7b83b1ca31f4e50531a1d5bfd1/94502158996.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/60748503507.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/dukalusa.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/zonabuwagelibe.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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 11216 bytes
SHA-256: 8413889b16e981f3b02be757ee4ae69578815c6991a14a2b9b2cbf88fc61478f
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 17324 bytes
SHA-256: 937c4a0297608ece628f522c9b5aad44174072b47198cea43d2d83a49e52f428
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1