Malicious PDF — malware analysis report

Static analysis result for SHA-256 62290fa3de49c81e…

MALICIOUS

PDF

90.6 KB Created: 2021-09-02 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf4dd7b97e4f6e28ffc8fe174cce0aa8 SHA-1: 0ab3344a0ffc6d67f5107364aae96ee6faf3bbf2 SHA-256: 62290fa3de49c81ef9b0393e770df1143f78e36178197e914812f8ea0ab731be
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The presence of a 'download button' heuristic suggests a lure to download further malicious content, likely exploiting a client execution vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=jobs+to+do+with+horses+that+pay+well PDF link annotation
    • https://gamepinleri.net/calisma2/files/uploads/suvomarevamodofuz.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/suzuxuwabis.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/xozabijilufuvilatupafuvig.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210831015559479165.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/10577818664.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16107453849297---fazipamak.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/fedenomogiwodajas.pdfIn PDF document text
    • http://webursitet.org/Files/file/50305707865.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/l8nqkh076na7s78etmmf0tel3g/47098200072.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607495e4869e5---8014551287.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qrp15epvg6bbobvm06p40clq58/tezaxutupusodep.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/xopiwupalop.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/92973104601.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/xazefobowutomari.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/nemikukapetemojozewaxa.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/kukamavobunebivo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c31baea2392---72127685495.pdfIn PDF document text
    • http://kaies.net/upfiles/file/37923666370.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/panoxujovikakid.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5dfe788f3e7f85acfa61db3e6d13f2e7/25817789234.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb67b09e---86416184994.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/dilibabelekatugumig.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/tuviridexogu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc09863f76---lidanigevilituxex.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/p21tbqul1rgqji3iggk2l1bjs0/gokit.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210802_175500.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_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10716 bytes
SHA-256: 120ef4ea2620ca249980e4e3c17b539e0e21ff2844b66743af6593f9940f8902
font_01_sfnt_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 17748 bytes
SHA-256: 80bc2669866d9a651d4b314bc8b563a41c07956aca1135dcfa1d56840b7eaf2e
font_02_sfnt_off00014495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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