Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d238aa7ccc2d4b4…

MALICIOUS

PDF

67.6 KB Created: 2021-09-27 01:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a292e1159d8aedc89a70bfd775d84a14 SHA-1: c37b880db292ca41ac034128648450331e96698f SHA-256: 8d238aa7ccc2d4b44f4c8b5a5fd2ff6791386b728af3ea6873cecb14289206c2
176 Risk Score

Malware Insights

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

The PDF was identified as a phishing lure due to its small size and the presence of multiple external links, many hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content, consistent with an image-based lure designed to prompt user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://aroma-es.site/yamituki-n/uploads/files/70483055439.pdf In PDF document text
    • https://vicareyou.com/userfiles/file/68028923252.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/93a7a34b503c6277e77ed81ea8ad0045/sesevikisikikeno.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147108aaba0c---nifuzunimamakarafesuv.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/82960668861.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/96810134611.pdfIn PDF document text
    • http://maulich.vn/attachment/files/vovug.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/19879400147.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/daziwapazexugoka.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/dipelozibijibisafojut.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/zuxuwinamuxisanif.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/v9dq23232sohaviojv88688ec5/23707260029.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/74532043633.pdfIn PDF document text
    • https://electroagro.es/pub/files/radagenarul.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/xowexo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b38apeur5n7ml8ckdjm89c92ko/safasogalorejiluvesep.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/mujewaku.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/niborekewazifuzowo.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/sedolejejilubekonakupifi.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/93786446861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=conditional+sentences+pdf+exercisesPDF 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_off0000acdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDB 14132 bytes
SHA-256: a09e92932733a3fbb8517848673bfe87890017eac774ee00238d7bac17c50cbb
font_01_sfnt_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 10744 bytes
SHA-256: f349f754cd7e7288265b32435eb74583c1c40cc9186fe9ec0b42bba29dbbe7e0

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