Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d758b920e21fe4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 12:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ac1c8343ba023aa7452df13fa8dc364 SHA-1: 26073d1380f51aa640e0b1d6730b45867ffc1288 SHA-256: 03d758b920e21fe43dfbd62698e4d32d55db1d85099529181c3cc59c65b08e93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nousgarage.com/userfiles/file/80448805234.pdf In PDF document text
    • http://philipsphotographystudio.com/73565843573.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9514f10241980c10bb8fe987a6209088/16101445736.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc35366462---80689592872.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16117d2e8a9ab5---tavukunusopevenipetigibot.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/56719756987.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/52089576740.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/36gukv43cs39kl52lt18qgmgc2/77909079099.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/nm79rjmcnuiu1en7f9nn9vdm0e/1861541850.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/80434718038.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/momezipikeviluzin.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zegesilojabovezutalejijig.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/madakemogunamisit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f0e2ce1f1---33004206889.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/jiwawusomekeba.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/toninonuxusikobajizoz.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a1ae554acb8053dc49241d205980b0b5/dujesepatojaro.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdda4c667---xepotogiw.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c388f110033---lepisedogujevimilatakuked.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e0bf5d9d7---kiroliduwodupawu.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///38978435632.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i2ci25phf32d6b7nlpmtqc7nk3/luvupetamupi.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/14806827943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=comparing+heights+worksheets+kindergartenPDF 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_off0000c2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CA 17352 bytes
SHA-256: f9adac2a3195287ef0accde09d2aa8dd3d03f42fffc01de76ec5d753774c84bd
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 11004 bytes
SHA-256: 7e24c58e7c3833def0886860f48d5a2404841c5c11b99407c8359d2d3b246e18
font_02_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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