Malicious PDF — malware analysis report

Static analysis result for SHA-256 37841c40a6481533…

MALICIOUS

PDF

79.3 KB Created: 2021-08-28 23:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25eff37b102c4f1d5b73a27ca8debb3b SHA-1: 20e54ed2b1aa76557750964c71d0c56dcc23c599 SHA-256: 37841c40a6481533125a58e61e104ae0c5d144b111a93f9b246286e1d40a5121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=grammar+compound+subjects+and+predicates PDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e5665e44bd4955d1a8e622f58bc3127c/kupamujotimopunadekewu.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/jerasuvowuzusorigazon.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/xubunomof.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/kusoranejurapo.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/98203363092.pdfIn PDF document text
    • http://unsersohn.ch/images/file/77925249647.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/48268915455.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/danugojali.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/voxatagidafina.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/revutixasotuvolivuzupal.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/dorifebukivoparosotodataw.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf268f500---selesakapubajeratulidevog.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/34473335609.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/larapinimizupadezurujubaz.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/pekigoro.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/21363585170.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/50864870868.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62932856153.pdfIn PDF document text
    • http://stonebreaker.at/76417152880.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608326e9b5866---14771288572.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/wixewudejejedusizuwuw.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9c323e59c40d61f8f3f4d704ec8d2e2f/fowediretosiluwam.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/bokomipenu.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/xamofivazozurafiwiposu.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_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 16692 bytes
SHA-256: 304bbc8d8eef539dc36ea87e36734462283bd1e69c091c826e37b34849607596
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 11040 bytes
SHA-256: abb7a4c92d2f2c8bf9dd375c753269fb6eb4954e5b26d3f0bb64394f7aed0cac
font_02_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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