Malicious PDF — malware analysis report

Static analysis result for SHA-256 59558bd3272d1db3…

MALICIOUS

PDF

94.9 KB Created: 2021-07-21 17:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 050af04b3f71117d7dfd36546fc7bae4 SHA-1: 91b13b643cc383192f99d4fcd9d7bf9dc437e59d SHA-256: 59558bd3272d1db30e9b01a05767d1d51907d2f43aa7289bb9ab7dd4f6ab8adc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm for SEO poisoning or phishing. No scripts were extracted, but the presence of multiple external links and the overall structure point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://kursadowicz.pl/Upload/file/badurakebevuganusixut.pdf In PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fedcea5f038fe3682ad0a2c0a936315b/befiwutalerosobawe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e981a1855d---dudifexiresifopibodi.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/paxuxa.pdfIn PDF document text
    • http://beateromer.com/bilder/file/dopeva.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/710d689f2d52f11f62fe56e75a29ee16/dopigu.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/vedoxoforesimubat.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3a69b1cbc---rogaperomuna.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/88208712290.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/79957690976.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/lexopudijepifitevuvadelew.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/52017791403.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/galit.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/26850415515.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c21058938---bevapolijetoxixuzijarezo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160700d1d1364f---wisor.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/varukawetupub.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/pitizasol.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dff1facf63af10ad30119fe10b6da408/48053508123.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8n8ok32iatbbgme3np080kirmn/newalarudidobotap.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607582a8ba7ca---tudilapixevolorete.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/13427141690.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/junekedosu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608920194538c---lidawoxozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+take+the+wax+out+of+a+candlePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 17400 bytes
SHA-256: 2d15e58f594a713452bee78beae7456142fdce3bda9cd71a0117d65564f1cbbb
font_01_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 10584 bytes
SHA-256: 8279893270201d5873b63c169b41abb7066e9fb08fa6f39602986f3800defd5a
font_03_sfnt_off000155dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DD 16320 bytes
SHA-256: 0dcfee8b6d2d2d0ff59a6477f4289c3cbe4594613395248f18dcd5f327d3c8e7

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