Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6f869d54b77d8a…

MALICIOUS

PDF

92.1 KB Created: 2021-08-13 14:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60195c0df7ec59a538cdd304dc9c3c89 SHA-1: a2e68d9e2ed79f4e47b5eb31c6fc00e97e7620e6 SHA-256: aa6f869d54b77d8a2bcb2398bd6f02713d7d9a7be6ffe27b70f1c1dd80df5f4e
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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 http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4d3c4be2---16550298373.pdf In PDF document text
    • http://newo.ru/files/files/10841332729.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/o1obalovbtrjivhf9gdp8e35ff/fevodupebufimu.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/kezeb.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/famemukovebemuzit.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/83ht11m0r4gu3e19ba5lm223p2/62680875241.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/wizajowererugo.pdfIn PDF document text
    • http://indecomavo.pl/inc/dodujoniwerifolize.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/gojerexuka.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160830e18c4324---pujidepavelupu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fe8dc631---gowakogatoz.pdfIn PDF document text
    • http://banquat.com/userfiles/files/daledividonumesifupaxuku.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9107fdeb36---medesujil.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/61188576689.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca933d036---wawezixabu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/piriluvof.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/03e35a898795ae47ef3270630bf0ff55/sipotigafirubesura.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a057b0ed9c5f3d6321db52416e634e57/wibagogodogojizu.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/65693198117.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d814881fe7---xenusoniduzimuzi.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/wolejaxinawizemog.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/budus.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/82690090736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=organised+crime+definition+pdfPDF link annotation
    • 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_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 10940 bytes
SHA-256: d0bb98cfaaa33305bb25d162316ecf9ae6de973373a15a459865c9933fa92f10
font_01_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 17040 bytes
SHA-256: 4bdea0d30a6b71940152c1327780a80d748a772a3689f42f1b35b2454e94f22f
font_02_sfnt_off000149f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1