Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a21983a1e7d449…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 08:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af3dfd40b76effb25cbc806673be4e6b SHA-1: 666ccd7ede1530eb95a9f2941a4e17b575e31b04 SHA-256: 30a21983a1e7d4492e183d89b6ecb719595b160404af13a896ca866fe05979de
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external PDF files hosted on potentially compromised websites. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wujipacking.tw/upload/files/25366019383.pdf In PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/mexuna.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zuzefegor.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/39598878269.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xexenimasuvobuju.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xegimipixed.pdfIn PDF document text
    • http://synfarm.com/upload/files/81856266739.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/51310978754.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/fenomanuwiso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d702761f6---jomidapebikasoso.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/14033083589.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/bujuvawawinemetexetesolow.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/gesevij.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/5152486675.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/rawegerukoxe.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/zomimerexetitikewe.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/k316nmrf420j7g1vqh5n2stauc/27367715258.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/51848212660.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/vojakut.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3f083d1e26a3e42d315622ebaecd37a0/pitilotopoguzonipapiso.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/kademi.pdfIn PDF document text
    • https://stormester.no/files/file/22083438149.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/57418458505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=aa+font+mod+apkPDF 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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 19780 bytes
SHA-256: e5542fb8bbb7f2652278f6273c811747902ed5b977753ad726db606b8e2ee39d
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 10196 bytes
SHA-256: 805f823b051af5851a59c3305d6ca0ec644dd1e9d02e015178f06693f595af3a
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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