Malicious PDF — malware analysis report

Static analysis result for SHA-256 90163f9cff8e9736…

MALICIOUS

PDF

98.0 KB Created: 2021-08-17 08:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6bb15856bc9f0fced26c8088f6c30f9a SHA-1: 412f09628f2cef658762c9db0b81e1ff1d41e896 SHA-256: 90163f9cff8e9736902aff7ab9a394d7c7c4315fe88857b047b82dbcf007492b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites and disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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 http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/ramuxawuni.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6feb546862---papemigusukonokadonudapo.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33254308746.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160beb1c513236---mijexijotaka.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452b7abe00---9342881108.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc03d25df---nubozadagudimiduf.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/kebeguber.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/k0ro7p0b61hc7k0c01pg3l3h4s/vabepipubukolimivexof.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f09bb7aeb---pasozewavubugokofo.pdfIn PDF document text
    • http://elise.pe/images/file/92485741591.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a52bb304---16316326633.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/53218218107.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2a81486024a3632e7dab8ab713d102b7/fekojolafejez.pdfIn PDF document text
    • http://www.520amis.com/upload/files/2314014482.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4fdbcfd52---81478899814.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/h2d4e1d78dl28ev0djg1r09sbc/guzape.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/49372641879.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/16854967943.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/65544219563.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/68144673244.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/vepategupi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/42d6801df2cbacc4676e78e560c9fd1a/finujow.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/53015100230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=caia+level+1+practice+exam+pdfPDF 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_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 18756 bytes
SHA-256: 5aef88dec38f1a95c0a99efc6be65c35aac12871c947411b3c11b7b8d6945fb6
font_01_sfnt_off00014837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001604e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604E 10640 bytes
SHA-256: 5bec1f8a5e9ce4a3bde1cfdb38fc6d9501c3daedd5b913adaf540e0c0db9f645

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