Malicious PDF — malware analysis report

Static analysis result for SHA-256 249533d6bdfd61f5…

MALICIOUS

PDF

112.2 KB Created: 2021-08-09 17:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f773d7edac7ea56d9653c13beb46453 SHA-1: 36f9af9b1e79cf1b8fd2c04d6aac35c6b3117f9e SHA-256: 249533d6bdfd61f536619f7c50a6070030875aca21783e540fcc19f2ef12d4ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically by acting as a link farm pointing to various PDF files hosted on potentially compromised websites. The presence of a 'Password-protected archive handoff' heuristic suggests that the document's ultimate goal is to trick the user into downloading an encrypted payload, likely to bypass security controls. No scripts were extracted, but the numerous URLs and the nature of the heuristics indicate a malicious intent to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=ativador+windows+7+ultimate+64+bits+kmspico PDF link annotation
    • http://rauvuonsach.net/images/uploads/files/sowesimazavizitadam.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/58823371010.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d1361a628---38748064024.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/gakesepefubowepodigeduti.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/tinugukiloxusokifabi.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51b1914cc---82767620254.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafde02854---82797264585.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/mipadezixudegimazekupisi.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/43727338270.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/vemaloxujotipijuladuzan.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/tobijiveselovimasom.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/kewedaxudezagada.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/15606559709.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/edc581fcce8747afa18730ebe6409c9d/jitawonagevi.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/fegajap.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c923eca4226ebb14eeea43ff494c58e1/xokotiwotidatagafib.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/rokimanilapo.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/26644592685.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/pumijininazubopit.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/rkuhrigd5dmkkhmo824vp3t0lj/xobeponesekelutefunepezas.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/januwilizusamo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a269f533525---xifovijosob.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0255ce047---29170637295.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102d1ac0326d---67930135809.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/91190238007.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 5252 bytes
SHA-256: fc53de5882961b95bea70cfc91d5990d35d369f2e19890429985f49ebb7b2b4c
font_01_sfnt_off00012d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001452e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452E 24960 bytes
SHA-256: 2909d4eca90dcad00071097adc612f0ebe2318103ed65da89948c077c96dd35e
font_03_sfnt_off0001816a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1816A 11436 bytes
SHA-256: 951d5a77078ba2e245d1d17bd449fa60fd5ce7dadc5e7605b6137d19c17b5a46
font_04_sfnt_off00019c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C5B 16212 bytes
SHA-256: 29002a180859b2f2c85b598815da510ecc178b5aaf66077917165a1e5ca67f64

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