Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c10d4596a993f5…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 04:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fcf98223bb715f3e1e8fa9c2b0944c2 SHA-1: d843bba773116f3ec0bd3d49158d08642f56ca5c SHA-256: a9c10d4596a993f502256688364ae0a4ed278a2cd1160d03228d04967ff368f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/t93fc9rq9b2htv2hg8l4c1gmo5/bukarewatonotejo.pdf In PDF document text
    • http://thietbixanh.net/uploads/files/2597624950.pdfIn PDF document text
    • http://spharma.ua/files/file/lefatagetepedagedigob.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89971703954.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210902083204.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fedd34806c04012e3106081738a05dd4/mevaxobubarabudi.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0034c5bcbdd3de588f7132af0a90f787/gijasosag.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f183f995---benovomefuwafaru.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7394ee929c---55692871767.pdfIn PDF document text
    • http://tipiland.net/upload/file/pikoremaxawevozezufidek.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/sugepuzonesalis.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2218edb550e2dea46e6aaeed42495b7a/relemogog.pdfIn PDF document text
    • http://keitbg.com/images/files/34730334899.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611afa3998c0b---1813619237.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/23948214626.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/20529145826.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/legodivojotosuvoxusani.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/kexelosozon.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/92110118216.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/953abc483f0b5f599f84bd399548a224/93720786167.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/xetikega.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/bivoboz.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/vexalarubu.pdfIn PDF document text
    • https://dhesient.com/media/83424077437.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2701b31a---68436326838.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/72906430816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=point+of+view+worksheet+2PDF 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_off0000c1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F0 10468 bytes
SHA-256: 3cef0295bcae5500f9b9244a6eaeefc07776df11136f09a48caa7abc4d83ba92
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 16352 bytes
SHA-256: 23de3b9d3f88d9b5881076f828bf8343df1a4b264bbd501ddb6fa7d261aecb57
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1