Malicious PDF — malware analysis report

Static analysis result for SHA-256 162aa72eca7f36d4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 16:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3b4a05ee359aaecf58aa44cec652da7 SHA-1: 96885bf74b1140ff83d802a112088c30faec5a9d SHA-256: 162aa72eca7f36d468d425f57c7ee602d1b68331cbac260f26e8fa78dbd8b1ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gustosandvic.com/ckfinder/userfiles/files/2486924963.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cc4227cdadadf1b191fbd92e1e39e5f4/85620939069.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/92179125667.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2bf82c51c---99669277937.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/lifogigemegutolo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2fjmq1jgtkophct517r7l6qdda/9381655533.pdfIn PDF document text
    • http://attlas.center/userfiles/file/32115046388.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/84210679669.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb765eb98---sovosifodufegunovavudu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/13622575811.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b1356d00c6554175102f28586290af4c/85885554869.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/15161691235.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/75670414331.pdfIn PDF document text
    • http://iccarrentals.com/files/file/81441971781.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d1374d2a---76051880518.pdfIn PDF document text
    • https://mmszke.hu/files/file/robetuxovokirovu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/87mre8ke089vk59hp1skan7do2/liwabojegetubudalaki.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tikuvozirunem.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e59627b82e6---xuwuvumudiwodamawutu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f12f856f8---vifiwezike.pdfIn PDF document text
    • http://placc.info/up_image/jejajubipekozejejezalipav.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/23702397128.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/gugabirajesomusij.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3be2e5332---wemadakedawasirivuxov.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006b60ca65d---foxalefurorenuwamufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=resiliencia+libros+pdf+gratisPDF 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_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 19336 bytes
SHA-256: c93b2bd976593c3d9a8e085aea6884fdf0c3016e550fcc7ac5490d8b580eb1d6
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 10980 bytes
SHA-256: 42de9a9def5d981ae4e94e37915df385f744cd2a523ee0fd2fd85ac622d3dc2a