Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b917e0909d587a…

MALICIOUS

PDF

83.5 KB Created: 2021-08-03 02:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98f263cab76831e96fea4e21022ae750 SHA-1: 4eaf62858fecedec5baea37cc5c6d3beba3a20e4 SHA-256: 51b917e0909d587abc104c2c235cd510b649657755e2c331b774b4abd83db066
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of multiple distinct hosts and UTM parameters further supports the interpretation of a link farm designed for SEO manipulation or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=ejercicios+de+operaciones+basicas+para+primaria+para+imprimir PDF link annotation
    • http://medob.org/SITE/files/editor/file/jebeperitimuwopedap.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0468093001619780405.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/kekezusaruz.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/10576938178.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/78976890623.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ork1g3d2hk2b4kaajihtpl2vvg/paxom.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/76359289637.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0kc0otc6q9pi9aebjl5li606m0/geluwumisupedubupizuwo.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/96995408613.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/powubuxiribafozabepab.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2f513cfc182957c3e23d45df816ecb9e/lonibetuge.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/lr6c70hcg1ra5dscsp6457ufmp/93896646684.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f9af31a1---nulavev.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/358d33592fbc2aac7e7330936b1aeaa3/91058968572.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/613aed53007cf8d03fcf0f2cb471583e/fakop.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/256fee5655c12b589e982f8301708273/51034519882.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/66549019415.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ba9912802018db53a928e903f6deb224/ladoselifixomubipad.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/54920360775.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/wokixoguwesera.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a382cdbe0cb---22249843753.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/xadizovaxokugoluwamojug.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2fcf2b8197e948d1e5a6eb7ae247f159/rapudelum.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_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10784 bytes
SHA-256: 175bd807deb10a990ea053329df4231dd574159ef2c43266d81e5b8581bc5f98
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 18212 bytes
SHA-256: 52c930355d220c9cc96565c6c42729ad4d856f294d3e27aa481bd1c5bcc8f32c
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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