Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a19f37c0bef049c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 13:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 229301b7530e090307a330c24d2ec117 SHA-1: 49dc84e2f388a70e07299c1496c076018002ce79 SHA-256: 8a19f37c0bef049cc042eae924538a565d8733ecf9a1dffb90a0d68d05238ddd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and link farms pointing to external domains, suggesting it's designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the use of compromised or disposable hosting for malicious content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=chat+themes+on+messenger PDF link annotation
    • http://asckhn.com/acskhn/userfiles/file/bavuruz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149330ac4ed1---98444911203.pdfIn PDF document text
    • https://successalpha.team/upload/files/17954786334.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/2523529933.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/28484899321.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/78705395797.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/tiwudesasevofa.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/tukosunatu.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/31962713404.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/28461351204.pdfIn PDF document text
    • http://deltools.com/userfiles/file/48934847407.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/20303928540.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/86418633226.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_140337.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/59951209362.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/90744662832.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/68830924993.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/korunukabifagez.pdfIn PDF document text
    • https://sapporopools.com/contents/files/13255017528.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q28atjms9jea6r9mnmhr8mak22/68904425093.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/57259618153.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495bfaa8201---74361433963.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494b4e90707---3042138140.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/14964401241.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/72623094761.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/73393619582.pdfIn PDF document text
    • https://izometal.net/mm/file/xidas.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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 10448 bytes
SHA-256: 3233e11fcff9d4b141333672d83489328110b413bc99af7e6b0268f4f4251fe1
font_02_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 17496 bytes
SHA-256: 9b4b99a261f4d7de4717b529ebf706559251d82d606b90aac62cb2385e9be8ae

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