Malicious PDF — malware analysis report

Static analysis result for SHA-256 28711a9d394e76a1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-21 00:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d6193f98e22351d0e66eed68e78cd285 SHA-1: ac9c9b537b7d2c3bc8387da03dd8b72935ed31f7 SHA-256: 28711a9d394e76a152ba2da11824024bb2a82a3b34bcc04932d526bfc7c03592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure points to a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sgpeo.pl/users/file/pagezomivewe.pdf In PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/22205601737.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161349ad460a54---fuzobona.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/90406058724.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/goxaxogan.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/guperavujoreloxag.pdfIn PDF document text
    • https://insp.biz/img/file/47602603998.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/futoninupiz.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/38807378298.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/2680745176.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/vefuwonelapikobomodo.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/vubofiwisuxi.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/34846855578.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5cf4b3fe---surebigawiraxagifosukeji.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/tefatulafuzuxamavena.pdfIn PDF document text
    • http://someteme.com/archivos/_20210918122550.pdfIn PDF document text
    • http://mestan.by/images/file/vajozu.pdfIn PDF document text
    • https://basisangka.com/contents/files/sifuxedopokedopawuno.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/42186285340.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/runojojumunisiwitizukuv.pdfIn PDF document text
    • https://norservis.cz/files/files/27709461992.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653c76e1f6---96177878248.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da368d88a5---23703647175.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/48326449107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pavizha+mazhaye+song+download+mp3PDF 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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 15696 bytes
SHA-256: d0c60e204ee8becaa0fc9b60aa551fd55cf54156a42d50380657de11e32fdcd3
font_01_sfnt_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 11140 bytes
SHA-256: df198fd0ca18fce2030befd5b9470c46f15ee1a2802d5922261832a0d7b5c277

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