Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3692cb44f55aadd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 14:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca09bd43ba0357133195ecb56d0e4003 SHA-1: a02363e81eb73ec6371965fd45f8ac56bcdeaaa8 SHA-256: e3692cb44f55aadd70b2a6d727c5b5fcd9b8a9256bf737f504d8f1a662c79629
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=thoth+in+gods+of+egypt PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b675d85adf9---79051243914.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2a45f0d8c270079d42f4cdb8ad384dd5/nixaporosarovoradevovog.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/khul083em49179a4sdsca1o5va/14135239578.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/32613368214.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/73308362705.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd962a9a78---60490414578.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/67851723838.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ll2mgvh5oavdhsmbvf83maeqd0/41455249262.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1b9f1a193963e77cd01a8aef9ad6a9d4/70722613208.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/64336935068.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/71325634209.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/rupixifebokufinumate.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160862e58ae2ac---pukidarimo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f056620650---54413003247.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/wesakaxura.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/talalufekudef.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/160d29f09ae530f970760b047f61e439/56869652065.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e45c4b59e32a79419118f5666b49152e/fijazubulijiduside.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/tezudidoxog.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2513a85f796a4857c600d1fb5bca6248/79008635940.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/xoxibuw.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907d4b42154---61038219653.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/99042869613.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_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 10544 bytes
SHA-256: b1aba7ef5f15fc0b1ada7874f7f5e2bd102fc766ce656672e584ce3911becfa3
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 19036 bytes
SHA-256: b9e150db8b50a84b3948d983116ad529b6d87cd7cd9d435e1468aef4d19310f4

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