Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e778428555207ae…

MALICIOUS

PDF

80.2 KB Created: 2021-07-08 01:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d518c67a92e2a124167490db15db6715 SHA-1: 60d40dff2e2c7f06764dbb5e71ce3899ab0aafbc SHA-256: 9e778428555207ae455c3dff36c7bdcd20600ac23f153a1a26dad112adc86ba5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The sample contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or link farm attack. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=5+percussion+instruments PDF link annotation
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc7a267088---67013242384.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/84049533308.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607223e41ce16---zizaromogivusudexulalov.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/rotipu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096977087c1b---20365378179.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/61312306704.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94b9b5e81---82671381650.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57b291502---norinex.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/45538287823.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/9956684688.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/5e6g7llpikl4h6rocsb2ct4je7/17615533470.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/safh17o9daj133n5scg3juvrk6/fasatunuvusorilisunu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/199648fb031d8eea5a96d0ebb9a6a412/80809748165.pdfIn PDF document text
    • https://kopari.hu/files/file/97183207065.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c80b40bfbfbd1372fdc29d4b5985f81a/xonuxudajomu.pdfIn PDF document text
    • https://yellowstonewildlife.com/21621326913.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/38622201686.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/9146376015.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/f7oi7md2slr4ej1eauh7qn8u6i/99671753651.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/suxevadejezapiterenom.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed47a96f73---gizuwoleweduv.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/20725518772.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdff1e8826---nuxubuxiw.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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 16812 bytes
SHA-256: be219f7fd2e8db342db476719f82861b72871948ca8828495a45b88e2390001f
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 10464 bytes
SHA-256: 981d128ebdc5b2c58f9d62205c70aecbea71bdbf20e2e83fe11250e13855d1a6
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1