Malicious PDF — malware analysis report

Static analysis result for SHA-256 937e61fae3c87a64…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 04:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04dcdba4ee56816ffe5b2eee239dece3 SHA-1: 19be5cef40e49199ae560e9c7c0702e905784ce8 SHA-256: 937e61fae3c87a6483633220122a62f4509714501a5fd137a21ee12f6dcbd6c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://garglob.ru/uplcv?utm_term=sweatcoin+walking+step+counter+apk PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ea845e62a6ae376ab6d4e42b00f1cf76/vizulutirenazid.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/xekulixeniramaxigudef.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/valujusul.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109102322312593.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/tamenifopupijilesux.pdfIn PDF document text
    • https://tekartltd.com/upload/files/pofez.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/gowijiwefapevewuziwukebe.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/287db411282d34e179c90c4bc4d7fb57/22271171765.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9b3981600636bdbc787b1185a88bfb19/56585557795.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/53780749176.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zagawuporololilozu.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/94737400493.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/nujakepatevedakuf.pdfIn PDF document text
    • https://jurad.eu/files/file/tebivesatebigixekuj.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161408f9a6df72---53963658766.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/dokuvipimi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f57291cdd1---90443772060.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/43407984999.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/51256515977.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/getejalisutakigu.pdfIn PDF document text
    • http://domuran.pl/files/file/xokapejugobulumedijal.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/61800754979.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/7801461740.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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 20576 bytes
SHA-256: e618d18996de3e3fcd179af3b007b528307aeae04ec30d3432987c0c480c45f0
font_01_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 10904 bytes
SHA-256: ade61a64c75178ea3eae29838854c4032ed62d1a87152ac106d8e3064f5edf5f
font_02_sfnt_off00013981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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