Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ef329ab468ffa1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 10:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fafe90889a5dda5fbd94f3039b5e1480 SHA-1: 05efc66cf5652b9533ddc623279adcd5842b2cd7 SHA-256: e2ef329ab468ffa1f7e412dbf1378b57b7795ce6c23f04beae2ca7c4a06cd265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various domains. Several of these URLs are hosted on compromised CMS upload directories, indicating a potential distribution point for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4435417859.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb5665844---3991240379.pdfIn PDF document text
    • https://edusfera.pl/upload/file/logapaterogufesibuzufike.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/winidivixiteramut.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/63394643528.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/73132865095.pdfIn PDF document text
    • http://asustainable.com/global/file/55951647582.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/42844563192.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/51d277f228326d97b19be79436f9a39c/55925355574.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c268bc31f5c1351db3537422bd78a621/77406927208.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/97319317386.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/purinemumumeba.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/pefolawinizoda.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161396f2ac14a5---fopeduterogetavesatine.pdfIn PDF document text
    • http://erex.hu/upload/file/buxuzopozufejipibuda.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/04/13267783511.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/11404908230.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/86462878928.pdfIn PDF document text
    • https://mimpishio.com/contents/files/gegilolibilojom.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/10952584810.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/43485598441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=common+ethical+issues+in+research+and+publicationPDF 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_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 16088 bytes
SHA-256: f0760be8c6958a61967d0c7bb8fba40e2301e8b3525f1ea0d164ad90a5f1171b
font_02_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 11048 bytes
SHA-256: 33ad4b31b13eb3ab16879ca7878777dfa1c35f1b34f47d823362f1aaed962942