Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed295beed9b0ece…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 01:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19ae77ad173194015ae5119a849e4046 SHA-1: 9a8b8140323143a5270ab7a90b5fead2e97f3850 SHA-256: 1ed295beed9b0ece5b1aafb7b7fbef65663a67d20e72d23109959cae71f71c40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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://synerhu.ru/uplcv?utm_term=types+of+triangle+and+its+definition PDF link annotation
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/32557154255.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2b9721bb---tonurizixazedeku.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f69e1fcc0---93481627037.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c0e4464d58754b9761b8eec70157c7d8/zabakodoreninuj.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/dasatugarakubaf.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73010e651---pasuvejuved.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/nulotamomifemem.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/3450646204.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/povirubexidi.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/nosafubinuboxuwegirel.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/gakatadoxadolutukevux.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/puforidijade.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/265872184.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/lusofofaruzebidebexag.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/xofipi.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/48389391168.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/46282142062.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/40420237541.pdfIn PDF document text
    • http://charivne.info/images/file/wezuvawolil.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/fovajuf.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/faroduno.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6bed10b917c82abf21d3cb575620be26/zogorira.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/sikole.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20113010300.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e04966864---74809835336.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_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10748 bytes
SHA-256: 37af89f9717dcd3bd6aae41b0c6708a24582195572313b0a1d0eecb4a8118b67
font_02_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 18488 bytes
SHA-256: de4b3ecc32139414c44f04bbbc5fd5875c8a43f96674ae174aeec93ca85132e2

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