Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb4724bf4536c84…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 16:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac3adac2e855c9a253bde4f463f70b0d SHA-1: 2b599f6f4121e2828d1c95c7b02b684bcbc0a7aa SHA-256: ccb4724bf4536c84d0009b95969ce3284a19b83431adb2724f36381caea3fb96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs likely serve as landing pages for phishing attacks or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=treatment+of+actuarial+gains+and+losses+in+ind+as PDF link annotation
    • http://uppercanadatwocylinderclub.com/clients/877835/File/zadodixur.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c071dc7a6ace7832144f939bb031a54f/86681496864.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0aa633b4---nobonuwopexi.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-8/20210808021050661053.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/58490492636.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/45128334901.pdfIn PDF document text
    • http://svx.su/ffile/file/43568288420.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/warelumegufumub.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/21a326bb7b78ec23785a4237067abfbe/7437283081.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/lolemawoxagerubaz.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/zutamorumikekaw.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a8a2032dc72a053f8b8c08788eaf45a1/25088376948.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a1ec8c8e86e1b15e906e71d97afd2a56/12551860580.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/00b60377e01c1324c202499254e6a96e/zoximaninakeg.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wokema.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/8ni2mt2t2k93ivudn355br3vh7/powopobipuzajilakaruf.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780da07e0d2---48881807480.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/supokofixebatub.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/63242286410.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d3020a9d---wosagiriwumuragesiwo.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/lawotisikisigu.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/86338774466.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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 17604 bytes
SHA-256: dbaa606f51f257950a32507c684daab62ebb98a70ff5bd527b93deb952e69b50
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 10884 bytes
SHA-256: a21c75340032394b40a2cf5631ec842529c3008f2958055c2a6382f0bac6678f
font_02_sfnt_off00012d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.