Malicious PDF — malware analysis report

Static analysis result for SHA-256 9642d2954b1f09dd…

MALICIOUS

PDF

96.5 KB Created: 2021-07-08 16:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f6f8f0c75e6225225dd06dcf60b43af SHA-1: 9a47f722186e528bbe14ae2bb8c5950e1cd5a9c3 SHA-256: 9642d2954b1f09ddd6b32ca9251c0c18eac64bee8d9a9bd7a869bd762e33a4d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://crewmak.ru/uplcv?utm_term=how+to+draw+a+chinese+dragon+easy+step+by+step PDF link annotation
    • http://mousike.it/img_ins/files/nogazunadogewawipojajadu.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/62855676042.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/resilegadijed.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/mopezolexawedono.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/85989660168.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/st20rpr8nemgmh88pd5helb9kl/vilusovijitalegezag.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67a054510---japovifomudebavonemikuj.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/33009034851.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b87ab7501496b9aadde028205d11d72e/88915689130.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/m9ueh4vdoumd9keiki9upggvff/59577981076.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/tijitematigeraso.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/d6vhk7q6iqutpbt3k4qsja3ofk/84669853030.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160819385c7054---jawesilofekebimixurizifur.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc67e84117---24553619740.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/zikezubesozolomesuzoga.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/23c8b44e49d5cac370310d36a53091bc/porurorezasararaz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a194f2b713a321760fd59bfe1042dc59/kinoxefifekozotubusodojub.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/47996474281.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be01715aa26---ridimulekapipiz.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/poguxokuvuwuronag.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/04f133fcf751efe788f370c5984aa389/wizitugowafomumukerod.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8eb23a4e---31891742310.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/25087098098.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 16892 bytes
SHA-256: be7d68b67770d5af16d6096e39b342e2a76a260ce94882af3f6d8d160bf036f1
font_02_sfnt_off000142b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B0 11076 bytes
SHA-256: 52417517484a7049f54b858e99aed05a9060b89e877ff92bdd6ab22c107a1500
font_03_sfnt_off00015c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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