Malicious PDF — malware analysis report

Static analysis result for SHA-256 a747fe196a05710b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 06:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 881a727417c70db4d52b759e760dad15 SHA-1: 878d9ca5d4db4b8101293d9e8b06db6fc1604c9b SHA-256: a747fe196a05710b078f03ab8aa87dcd8537816c1e7fb010dacbcea8e0eeb332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting an attempt to distribute spam or phishing content. The embedded URLs and the nature of the heuristics indicate a phishing or spam distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=where+can+i+watch+violet+evergarden+movie PDF link annotation
    • http://yejiya.com/userfiles/file/32690901340.pdfIn PDF document text
    • https://swiz.eu/files/editor/39727331111.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///wirilalodosiwizudufo.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/75724967211.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/godejikun.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/gobix.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/908538834.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/66118354909.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/69274515581.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/62401326708.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/18144949917.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4f6c36395---rovajemumewunewovalakobo.pdfIn PDF document text
    • https://roxracing.eu/userfiles/file/47106942199.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc6850ca8---nogaxizatuxakowizameru.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/51441115935.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/52087909076.pdfIn PDF document text
    • https://airshow-bg.com/file/lipadikobarulilejujimuj.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a7ddcf5827b63a1cb87cad848aa276d3/55532759686.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k9ns5uovupdjmi68lkehej1s9s/57664683592.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/82643518683.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e62b347553---tonope.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130e7134fd81---fegezerixixuwonola.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_off0000b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 14548 bytes
SHA-256: 50ffd91e06af59c2a0d10b2a8c56a212b58978f7967807ac22dbd517db857a5e
font_02_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 10796 bytes
SHA-256: 16a5f62abbd602db90164c03e841cc41fb1e071bd414fa8f3692209620b2fbdc