Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e21c87841952d1c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 11:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 28ad34ad768474bafa04fd3357a803c1 SHA-1: 06e631f843c6df35cde5f80a5db3e8a6a1e3acda SHA-256: 9e21c87841952d1ce56f0c49359ac23e84f8fbeb1dbb4ba18303a92948857983
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, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm on disposable hosting, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=daniel+c+harris+quantitative+chemical+analysis+pdf PDF link annotation
    • http://caramelitos.sk/files/79663429496.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/bodeduxuz.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/38096062575.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/fofubibepajewe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f75eb92c---fezuxesumapoladogebutimig.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/10453662062.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/ruxawuriwijekal.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/vofebiga.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/40080877058.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/libaxununezoxenarawexi.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/13734123535.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a0dd3e197a315962de4e576da824f436/butumutokiwidafololidewu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/70570043116.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/juzanumizu.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/2210589547.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/kitidosaniwaralu.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/mimumada.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/zeparunulezog.pdfIn PDF document text
    • http://vo23.ru/upload/file/fatafivatabo.pdfIn PDF document text
    • http://bushurov.ru/images/files/fegakibixule.pdfIn PDF document text
    • https://luminex.pl/upload/file/lixuwovifiwetaw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613396f73a1da---fidusokebokubarutu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5d867751---61529154188.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210910_8669F5E7E35E402A.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f27b22e---99470034249.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/borafuwuwib.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/pukotopoz.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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 11192 bytes
SHA-256: cb6319f1c46bf91f33b2ed2adc3b51cb06dd6463937434dcb1c69d316a036294
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 17644 bytes
SHA-256: 48c3aaf0b2632e641cb3ab93cc26d13f9d82d8cf2fc962115e5ce2f2622cc168
font_02_sfnt_off0001260f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.