Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f9e3980a98c1c8…

MALICIOUS

PDF

72.4 KB Created: 2021-09-07 11:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fab1c6bca004e3b3b189aa7f0420ff3 SHA-1: 144f6035fa99a47a15b2a38d4ffd56c92418ebe8 SHA-256: 09f9e3980a98c1c846d841c74a4bb38bb02d108d6bb02d4ae477f4852303c66f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/98c9084179ee90b9addcc547baaed205/74808713300.pdf In PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/gixitomufapimuni.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/zatetesubujogumasowumefa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609831763ffdf---kamaxisexumukelosolo.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/feromigo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b3dffcb2cbb0af44a837f79c63020aaa/58797562515.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce8475214---jobomegulireluxunezirawi.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/jubilusatu.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/74329597666.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/natusutafibap.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4f63e4fb---kategutumudogot.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae0c0056e---witorofosi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608774e2d617e---45076686363.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/42934041295.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/94273050891.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0f61a28e41ae4223e5394d82ade2ad19/wonowajuvog.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/47299761667.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0c532997---64732427680.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774cd9b1a40---velazizekasaluri.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e1c4dc87eb686a9890c43f430f470043/1504509550.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/73459090575.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086902d1d612---fujumuxosuvufepawur.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/40498201487.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/setebimosojigijev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ncert+class+2+english+worksheet+pdfPDF 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_off0000ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4D 11172 bytes
SHA-256: e2f5f23b91d43526157be03ed52149969fbf42cd5971d2ff2df53dafc9b2751e
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 15480 bytes
SHA-256: ee4aeca3aed9f495fd70b239930da434a9551878170c16b407e634023038748f

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