Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3726dda9f3de0e8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 12:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bec9cd6e8be4294a7990881b1e186e1 SHA-1: 457810250cfe6477eabaa3d97443ffd59c112702 SHA-256: b3726dda9f3de0e87fcaf310e209b8d96bcb3c5cb881496583c39df038724368
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://infrive.ru/uplcv?utm_term=1+word+insults PDF link annotation
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/35836379880.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/70730846941.pdfIn PDF document text
    • http://indel.sk/userfiles/file/wogijabaf.pdfIn PDF document text
    • https://capecoralliving.com/media/file/midiniribaluxotuverokugor.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2569282d32---12743018623.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/tlutu6nno2mndaf9fvvdle9sk5/netizanidexodovubi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/76708229579.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e798e756db7c3c309ac98e2161d1fb59/debupaxofazuv.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/84162857368.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/keziduroxiwoxite.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/zobowowatug.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce8bddd5f---tapakusus.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210716_447E48554E6EC6D7.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1739f1466---fotovixegitibupaf.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2f988c71---7293755182.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6889dc231a---64437983998.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/73909908607.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02d2b203b---fumudela.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/rivuzuzuwamijo.pdfIn PDF document text
    • https://esvigo.com/upload/files/93523122477.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630271499.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/18590948333.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sl35ud01a53jdm8btbq8fc0fdq/51881376246.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9a7692b3---11015739751.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b89f0ed01---59238964051.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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 20036 bytes
SHA-256: c642a18c886875704b05aee8c43dd00e8c180331638b83bf4ec4f54959ed65a0
font_01_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 10088 bytes
SHA-256: 10848d6d123532b5efc0e99cb3f016fc55a2f260ca183b0a4bae9403358eecf4
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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