Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff7a6246fffe653…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 02:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32d656fe70d1938f314f272f47127a4b SHA-1: 2b24f82dd77ba5f511ae4f7c8eaa7bc2ab67cf60 SHA-256: 2ff7a6246fffe653bdf60734ae39c4bf06a27329c7d07b14672ae91b9c3c5635
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. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic specifically identifies a callback phishing phone lure, aiming to trick users into calling a fraudulent number. No scripts were extracted, but the overall structure and heuristics point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df1cc5d43c---fuvid.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8100b2d2---12413054065.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210611192646.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3cc7bb7f4e39717b3e43d9f4fc07e8a4/fumavolazajomosivil.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/epapu63flh8tdiqoarbe2n0u3h/nefoxizuzep.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7bbd5b90d32e82fa5fffd79c2382d246/pudimukumoju.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c1c361bb---25514878758.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/172329212576.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160717a1049dce---bumoloveburijax.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084b75f15611---69267242153.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/werigatidex.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d6b3976b6822c96af3e7ced43def94bd/85072548469.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/nuzusuzefuvalowu.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/vogupusibasovo.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/xepowawumaz.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/27940137946.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/418b85f48859cd3e16f156cd78850667/57024193620.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7dabb6b86173a0cc488e81cd682cea7a/54909091942.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/53024686503.pdfIn PDF document text
    • http://intergeored.com/upload/File/2581540932.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fe52d36841576188370c9277e25e2ef3/tezefajekatopudub.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e3127340---58933118798.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/midobepotadaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=demographic+profiling+meaningPDF 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_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 10664 bytes
SHA-256: cffd53a82b01e28f9940575f0d7dc20d3d0672f2b3547f6d10c913f978c5c392
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 17532 bytes
SHA-256: 935cf33b7b78c9f6976ae7fffbda2c26762c4c6af6885ca7a48b663fd13df76e

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