Malicious PDF — malware analysis report

Static analysis result for SHA-256 78db5ec60f2be13e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 00:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7b710b8bbc3202553715d3302b2df96 SHA-1: 04d82cb7ebde8a91036f089a660bebf392b135ba SHA-256: 78db5ec60f2be13eec6e5be7f0b1a9f1da3ba03723624d1e514a4a991aa71699
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The document's structure and the presence of multiple external links point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=ejercicios+resueltos+de+varianza+y+desviacion+estandar+pdf PDF link annotation
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wamumeza.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bakimu.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/058c03e4241910f03c423ee202b758e0/37354957994.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe8768eef8---lejajologo.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/9600025767.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/420ed6e5af7ab5df1c536036c0cd1126/wewufegalukusixoj.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bc5fb21b97c384611e4d5dd1b9c1e907/tefokonijetofoloxubebe.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wagirurabekopadalarib.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/28192115160.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/93282021944.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/85516803215.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cca6e2d65---23514214461.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161271ac2cdf0f---79990574442.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/50712101434.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/xakufowavukamekumupir.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/mujudodogudabixed.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cqc85r4d0uhsvv96u0fqm7kh8r/sitawekugowo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e56ff280da---62888183071.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/76879804353.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad7a0c296---8497685621.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suwojuwuwodat.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobixarubomataxaw.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2bdr1uuoq3jd6b0b0kmeinu724/53341134913.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161032083354e7---41865532636.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_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 18268 bytes
SHA-256: 10c79722af52c3c5e32aeda03db5ffd9164a59dcb09647528f6ecea7facb0009
font_02_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 11064 bytes
SHA-256: 6563dfe02810a18bd5b83f02d650e8c8fcf4ce2f281eb857ecf4404d7940c457

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