Malicious PDF — malware analysis report

Static analysis result for SHA-256 713f0aec38984d57…

MALICIOUS

PDF

90.1 KB Created: 2021-07-06 16:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa258824ad9f6ee7483235c808fe8cf4 SHA-1: 29b1dbcb14a8c595943eb4d2145dc177c5d51d67 SHA-256: 713f0aec38984d573387731ab4f9b3c51d0d177585fe7b090a90ef24feffb269
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, which is characteristic of a link farm used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ppahsuj14cua1dm07pva7gv09h/14651787187.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/b3l3d9bhrm1t80k49rudhtvgsd/pefuwanefopolutosepe.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef271f30d---labagop.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0068285c---20395148938.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5daa3e8c9efd51c0addef5a2af34a8c9/mezamolinizoj.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zugajazawelanufada.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608b482d1eec1---63887141308.pdf
    • https://al-wesam.com/userfiles/files/62353495788.pdf
    • http://munsusa.org/userfiles/file/20210621095410.pdf
    • https://heyratacademy.ir/file/68908821143.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c8d059c053ac51c6d68a4dcd6f35e1c5/lalawutiruzupoxirob.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1c6b74f9e517806942bd434aef31a1f4/97638928150.pdf
    • http://poslovniimenik.net/firme_data/files/27105741858.pdf
    • https://absoluteanytime.com/media_file/files/files/53933525263.pdf
    • http://batdongsandautieng.com/upload/ck/files/78136219906.pdf
    • https://etadelloro.it/images/file/linozarivobon.pdf
    • http://kielcenoca.pl/files/file/48731053001.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/qpsplpdrmi6i4nepmqf36c1oqf/manit.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb146570f---sodugikudewexulajewaxo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160934b65e0c42---99142981961.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsrbh5l07am4dpp675q1l4rhmi/xalik.pdf
    • http://amajyuku.com/files/files/6702502952.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c64a6c31bc6---73320823743.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=congruence+of+triangles+class+8+worksheets
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f3.bin
b3c9c1eae23291d2ef7d5ec7fca2cba70b5b719b18b0c559b2c7895318632305		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 18600 bytes
font_01_sfnt_off0001130c.bin
e4b8c3b177cd937a9afe0bf5809dcaab6010bdcefcbfa0a563e5d7985a592920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 11132 bytes
font_02_sfnt_off00012d1e.bin
d06246de5fbca08a8e71b3266423534d5cc020e17a1f81eafc946de7058d617f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 16088 bytes
font_03_sfnt_off00014254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.