Malicious PDF — malware analysis report

Static analysis result for SHA-256 e596b8b140124f33…

MALICIOUS

PDF

91.8 KB Created: 2021-09-08 07:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e31b0f4bbdba5d6961ef5e091930b2a SHA-1: 0fb89cbf018e9417dd1bfc255b2bf45b816d2b74 SHA-256: e596b8b140124f33688eef2fa5656b1ca76789041580b9ee48da0bc40b5769ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=constructions+class+10+ncert+pdf PDF link annotation
    • http://njboyuanchem.com/upload/files/56844285192.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95152ddf86---vesozusipoji.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/60177092b8a79ecf058f76432c138455/64062171008.pdfIn PDF document text
    • http://cristalensi.com/public/File/58005775342.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/t0p7lubl0gqm7q4ul0gnd5gmau/tiligasuxe.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/11207710445.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7b1b1c03171bb1b1149abe67f2ae2667/63148825305.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/dolelumaredinoxaxeda.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/zamuvi.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b1aaf0adf3d48abe451502e8d7125ca0/kefofuxurudemepitawosigom.pdfIn PDF document text
    • http://fullx.net/files/77899085902.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af5bc8c0c71---xedetalipokipazogup.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/83245195455.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035969548a8---48487589219.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/nesipipovivivefonuvov.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/27264653331.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076df91d4a54---77526403924.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/61310963920.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/vubavakuji.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/11672296553.pdfIn PDF document text
    • 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_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 18372 bytes
SHA-256: f86e0af4dafe50cf75223baec73ed1da3f7d19c27ed99ff8550776f0e8a7f4d5
font_01_sfnt_off00013053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13053 10916 bytes
SHA-256: de9ea5d366e2f4303c5268776e619c68326e431aa4d821b8e9fc2fb9ddb6822e
font_02_sfnt_off000149c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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