Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b670118555b3b74…

MALICIOUS

PDF

73.0 KB Created: 2021-06-29 21:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5676fbd5d9306c2f371ff88831fb2c65 SHA-1: 3f16877575033e3503f94047bf318f9f87554c2a SHA-256: 5b670118555b3b745ffbebe9567c4e7ffe13ac974be5c7a2d9b2bf5e4662d56a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users via these links, which is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c34b46a6530---jusorezudupul.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/66551a133d465f098c342cf06aad075d/68619710666.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bk1i0o0oj64rle590ndi1296b5/34689667813.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8919210fe---45119072696.pdf
    • http://nordicaluminium.ru/userfiles/file/46572128747.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/3j4670icl47s8eior0qu393qj7/23965479309.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/s3v8tfde53ht02veg7f1jsp6b4/rizokijinefubaj.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/xiwagakekirekulatosu.pdf
    • https://amblamy.ee/upload/file/folataz.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/oo039h5302d59a7oqb1tpsu8j8/41056815552.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c25e24ac2---bezujavifovenujumawe.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5c85112d---36793633009.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a66925cf3d6---54955439357.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/03d849bf64cb05518733f5b2645f62b0/wetafefowinulalanuk.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/84185227100.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/dumadim.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0d967925b1740f716ea033230ba63a54/21051200282.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee9e6b6025f1cac1265189f044c25469/74561236843.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pv8lefgbrqk2p2e3lkobss5h0d/89686805294.pdf
    • http://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/10104052506.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/9295187401.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ef8e793ef2635bf0a99ac03942761a86/2517442004.pdf
    • http://hibertek.com/image/files/20210622_220428.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61162da862---kojuwavudojizo.pdf
    • https://tonwen.org/userfiles/file/pigofatemulaxebuna.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01fb040e14---forajopesafimizalufisiwok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=electrical+and+electronics+measurement
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf3e.bin
fadee700f099044cc98c78700c1fec33dd8a2be86bca3614b98044fddc45f651
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 14656 bytes
font_01_sfnt_off0000e41a.bin
04f35c6389a2e28aad59be16f87c1efeeb18608680861d03d0c4fcbd80124268
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 10616 bytes
font_02_sfnt_off0000fc51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 16792 bytes