Malicious PDF — malware analysis report

Static analysis result for SHA-256 51288fed0d926ac9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 19:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 557a72a1c55cb239d3efd3ce877d01e5 SHA-1: 810636c2cd55501c5b604a07acb94365ede8fc0e SHA-256: 51288fed0d926ac9995f2c27061597015dd0588f2d14868907df3c6a86e5cad0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=hyperloop+pod+competition+pdf PDF link annotation
    • http://mywymc.com/userfiles/file/10417651207.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/68824510683.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pokotiketerutubekewesaj.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608748b82c977---18994348877.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/12e054f63014c0f9472c5825099cc237/vaxivedakafisetugosabarur.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b9000a1d---boxutitoduxuketalufil.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/wumatekoka.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/deluwugudoperogusa.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/40014383301.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/povizi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdd18c903---tijaseminukotewubiv.pdfIn PDF document text
    • https://foulardfotografando.it/file/306448380.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/wemajomemoperebow.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5csr4kbkui76dgqjdo4c92b1k6/vupafa.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/mebozefu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0324f431909ffd074fd6856cd813a252/17380359335.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///dasiranavule.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b57350cad69a87060e7477f49a7236b7/60886165195.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75eccd8a0---sikitologobefivawadefaxu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2b8690e4ff28770fa16a60b88653ba92/gaxolorojoxe.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/71007362262.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d61568a56e---58817587645.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/nikazilelisumotagunedovu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/23252949493.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rc3o0jashfkh6v13moq4o147j2/wolanagoj.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d89ac65359e5d237df7b5e8c4384db2/nabarakol.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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 10556 bytes
SHA-256: 2e16c31b89e237ad1730d3612d01f6b7c1aecbdc5ef4dcd9c35cfff1b294d306
font_02_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 17796 bytes
SHA-256: 7e2b2b3337bf44a0306c0e04a72fb146ad2b708075a9f46ae439e77a0cde433a

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