Malicious PDF — malware analysis report

Static analysis result for SHA-256 55573356e8b08751…

MALICIOUS

PDF

75.8 KB Created: 2021-09-28 08:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 09cda18ce1a568aa1de695901b43a766 SHA-1: 5e7d424e51f9a53e5d4827ab3e5a6a0e4dd6394a SHA-256: 55573356e8b0875117f6bff9000224ac7e78036c11693f4517d3a75da31a34e9
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 of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/88212bba256ceb802c5f4c98c04685ab/vuxezu.pdf In PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/6978350976.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/28385722738.pdfIn PDF document text
    • https://serka.com/serka/upload/files/xisobojufusatenusuji.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/zosozelerakaja.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410e172fb55---tipususawi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613065f971bd0---poxedewi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/8b5c08082c6ac87cd4d9c2c1cd4d0f88.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614180079bfd3---90835452399.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/ragelutovizumomadan.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lakilagitumojazi.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/21883048950.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/24811193446.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5133bcab0---80718567327.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/34546687443.pdfIn PDF document text
    • http://brukbet.com/user_images/file/14635776193.pdfIn PDF document text
    • http://cichanski.com/Upload/file/gotikutikam.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/76270243334.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/ravogetisibo.pdfIn PDF document text
    • http://mp-journal.com/media/file/tuxameniwuvatizuda.pdfIn PDF document text
    • http://sns.hu/_user/file/kigadazuzafabilutolew.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/fokisetubupufebojudedex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+glasses+emojiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFA 16812 bytes
SHA-256: 0a812869048738dd7da1abcb13461df0ded767e8ee83347645ada953ea392463
font_01_sfnt_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_02_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10604 bytes
SHA-256: 4df825438d5cf7793dc279b7938d2c490362df54ae5622fc1227719fa8150212

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