Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b8661cd37df8f3…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 21:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99dac7035c86d7e587fffc13937b3b7b SHA-1: 9a5893608fc0c4617f3fb14dd510b68996f328b4 SHA-256: 42b8661cd37df8f32a8438481c923170c7176a34d184503fcc44b1dcf93d810e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into clicking malicious links. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c3c678dcd76f4b9674616e16f29f47c8/5625362705.pdf In PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/guvomoverupu.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/luwofewadetexewobalem.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132b969344e7---30090985557.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/54591958926.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/96413055262.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/kazageziwosazalilu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/28705930880.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/2576876235.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631129172_1.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/70898623469.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///zizovaleburor.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/duzejegedutatapokud.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/37150532396.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/kurolazuzabim.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/rasukekikolemiwemimawes.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/muxejefaxanagule.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/bogupukobo.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/13025241836.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/51744019683.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b75dc2086---fumilutizarewizi.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/gibumexo.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/xupufatewefemegixite.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/misimirefokorawesogasib.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/71988835464.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/wipivenerazudesewisemo.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911001558155261229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=video+not+playing+on+android+phonePDF 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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 17656 bytes
SHA-256: e8fc41e707a2d93ac87f7f7e64b2732c656756cad5181590d473a0b450117f9a
font_01_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 10588 bytes
SHA-256: 21f34665259a13071622971bb72000d65fbbf37b425668e8bc7edc9029246a1d

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