Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3dd7219543f6ba…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 13:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0abab88891deba7736ec1e56071ad6a0 SHA-1: 50d95e470771b2fe8c6b5577f7aec166c1b6d17d SHA-256: 1b3dd7219543f6ba43bc4c8c6ca1dd642b019e2663d55633c85688bc986efdc1
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://nomylo.ru/uplcv?utm_term=aircraft+power+plants+by+kroes+and+wild+pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079df5d72134---91678019419.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/39e97e4aab034bed7d4d1c421b1cbb25/91304935648.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/md8hd65fhmecjgrftuf837sdlh/74182508004.pdf
    • http://dieta-plus.pl/userfiles/file/lexutuge.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/15c25d5e7f867cad73f4f25f50137535/68704247801.pdf
    • http://staceyasp.com/UserFiles/file/25283535115.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a734af1d---zovalosadodor.pdf
    • https://altonika.pro/files/fck/file/turelufedopezibubalu.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/69bbcc9cf594e1848c36226dddf4a41b/piteb.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c865545b---xidusufiniv.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28a9da1e8---fapizotojuwik.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a759355fe3d---50060523805.pdf
    • http://czdashan.cn/uploadfile/file/2021051512454773499.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df1b49c6da---49883446729.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe041facb---86222685692.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e39cb0c414c79564e4f1776507884877/40858103326.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5e6dc278---10902542119.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ab03b6e3d76b9f73b6958df346e30324/vivelopitamawoge.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782ee33e18f---nitisamarixanenisa.pdf
    • https://goldenapp.net/file/fowuxutajojedis.pdf
    • http://seoulsquare.com/userfiles/file/mabuxoreredepaladokabop.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d9fa59a32---14197366210.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c853940bf51839c87c7d7b669894b9b3/20092535639.pdf
    • http://mikailang.net/userfiles/file/20210502070425_1063025093.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9da.bin
b1b93bc795e81bc5aa71949605a6b29bb94d1daa88d26767f2876d97ceae7863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 16180 bytes
font_01_sfnt_off0000ef81.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 1732 bytes
font_02_sfnt_off0000f7b6.bin
5c744ae33e1a72d3e4483dadafc2753339a6b087e58e71e55994fddce748349a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 11028 bytes
font_03_sfnt_off0001115d.bin
e0095cf58e3cc4f89f55330390d46666299982151693a47f9e2165106b2e368d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 17004 bytes
font_04_sfnt_off00013dfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 16792 bytes

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