Malicious PDF — malware analysis report

Static analysis result for SHA-256 951ec4be0ca8ef51…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 18:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9e6c92451818b105b26bc6bc0c82d73 SHA-1: bf47ef7c90e89cf837999a6bf9465e4f021abf09 SHA-256: 951ec4be0ca8ef513285998916a9cdb99ea8a490c94d3ae11c1a19b41b379421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. While no scripts were directly extracted, the presence of external URIs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=rneasy+micro+kit+manual PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e541c7960a161a3fdd84c309e0f5c769/puzazugasoxigi.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/73858911958.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210907025819.pdfIn PDF document text
    • https://pellevah.com/upload/files/83750220106.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/26ab55d333b2d1a625f59403a0af2e1f/kisago.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/37058352822.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/54372604232.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/39625702565.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/99872003822.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/rivumaliwivedodaxar.pdfIn PDF document text
    • http://naso10.com/userData/board/file/merewekugewukojujad.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/88059004016.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/monekipowajipu.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/duxef.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/65447970315.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/8649554293.pdfIn PDF document text
    • http://elitvorota.ru/f/file/29201288213.pdfIn PDF document text
    • http://wamer.org/userfiles/file/juwepegajobagogivaso.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/42352560397.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/18264195578.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/77945835273.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364cf965e64---70058883014.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/sudepegalisusofoxovif.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/58815203721.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_off0000b9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F9 17464 bytes
SHA-256: bde8f7f65c88e61cb4c772084a586490cd8f2286db1aee4078a6ae6836ea5583
font_01_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 10740 bytes
SHA-256: dcfd37225265417914ac7ff95d3da02d63c80607f88a642be6788e0164d475a7
font_02_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1