Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1a2662bf7861cf…

MALICIOUS

PDF

83.5 KB Created: 2021-10-09 18:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0242b6cae52b729ec1fe57783cd96685 SHA-1: 588584ff99233ebfdd4f2cbbdbb9ea1e4f9929ac SHA-256: ef1a2662bf7861cfce3eeaf33a4096ded934ae1872371831ff4b6003df375a59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs, particularly those related to file conversion, are likely lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ddc-touggourt.dz/ar/files/xivaxejav.pdf In PDF document text
    • https://dalba.net/other_files/File/moxujite.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/32755929322.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8dce59a31---vorawepuzenenulidiwaradej.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/rekuzitipinidow.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/15201987254.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/bebotapelepedegilol.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/lilis.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15b52190d---zesunukokobitojuwap.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/8623282139.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/lezil.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/dokokubebudevutizetosax.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/40767028773.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/25999600410.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/toxenuligotewovejomib.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/4652078075.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d876eee88e---pitosilulagotovuwoja.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/gejonam.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210927/16327119814303.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/movozino.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/fexileta.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/850dfef7e7af8a67848261474a34d2aa/naxavenesupubet.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561b4398583---vazamab.pdfIn PDF document text
    • http://xhzhengli.com/upload/zonifukulawumugilofuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ms+word+to+pdf+file+converter+onlinePDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 10596 bytes
SHA-256: 44700eae8127fde0e3a62ef6384f32548f3bf1d0cd1f0b3921fecf2b1dd0a7af
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 19336 bytes
SHA-256: 2f9eaa6f22943e98a9729e307da0f5ff0af6030adbc7b7d52eceef9127977eed
font_02_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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