Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad2280bce89a92a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 17:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c4e26d3384f494465b50493c917d4ca SHA-1: d0b7003fce3abbd780f8894b397ed3589032ed41 SHA-256: aad2280bce89a92a2643667c45e27b8f603e525705e1ae3322ae63630489f48e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://magnettoptan.com/upload/ckfinder/files/milejuremonup.pdf In PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/tarapekul.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb362855c1---vonajituferefikivexabiv.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/mojavikiv.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/mevezezukevakokerabijeboz.pdfIn PDF document text
    • http://sakem.org/userfiles/files/546168205.pdfIn PDF document text
    • http://gazetavk.ru/img/file/30526010563.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/92901755356.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/sofivibudibikiloloxifefew.pdfIn PDF document text
    • http://ge-mak.com/files/55123901153.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/26065900160.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0e2e547d---negerizarijuwuf.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/713252433f584248528ce091522c0e81/sipogonomosalagivuzi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133618b09090---fajugojerokof.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109080653004101.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16311172771431.pdfIn PDF document text
    • http://yoron.net/up/files/41251818577.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/93785763451.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41c38505e---36839182915.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/66717547466.pdfIn PDF document text
    • http://attlas.center/userfiles/file/29949201062.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/36726154015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=james+bond+no+time+to+die+full+moviePDF 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_off0000b74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74C 17484 bytes
SHA-256: ecf7bd4e37749f3dacf4eb467652ac85ad11b4213137b476029bfb0af913755d
font_01_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 10712 bytes
SHA-256: bc46df2beb5a1222744be4dd5aca750fe93a8318f03c82bcef9c4ea64fbec701
font_02_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1