Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cebd1aaf4fa2f4…

MALICIOUS

PDF

88.2 KB Created: 2021-08-14 05:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e630a3ff88ea04e2d5278896600438c1 SHA-1: 066581acd18247d8e70ec05b2964219d789756af SHA-256: 73cebd1aaf4fa2f459f860dd05eeb1ecff675afecad37cc6afd6b06f6ecc9f74
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection 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 0.9996

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094037687b3a---wifitasuz.pdf In PDF document text
    • http://darstin.com/userfiles/files/tonajoduwanupum.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/2785103089.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/05dcfd22861c59fce47af13ced601201/6695394504.pdfIn PDF document text
    • http://szwygs.com/upload/suvewezex.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/15uavh6r4hnq1t95ldtprh1an5/doviguruxazavudesisafeze.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160840199111a8---54864331122.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/41996088557.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad41bed3299---siwazuju.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bubonexaguvamuwagoxe.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/vedegugadesurifulod.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/55546248485.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jotivanopivelazesulajikim.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d41344af688---sufuri.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/lukezupotonilifeb.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/fefudovutuwasonofamog.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/xebukinewovifaror.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/lavapoxuj.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13737866050.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/deruxeja.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/32381008893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+connect+plantronics+m70+to+iphonePDF 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_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 19080 bytes
SHA-256: 80804f2a9441f6e777773eeace87eb4654eb265e44f04d03dda07a9f95d7e7ec
font_01_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 10888 bytes
SHA-256: df8d5d64009828ab7d52beff789042cf1145323a8c957a4a5fa7a23de8cf9a10
font_02_sfnt_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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