Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e44e2defbca41b…

MALICIOUS

PDF

97.0 KB Created: 2021-06-30 06:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94b64c3a437b44fb242fb6f6d2ef3130 SHA-1: 219fb1ad192c4d332510c873ad8bee2935e18e81 SHA-256: f9e44e2defbca41b17e295525775e0d42c84eb61c501df75ff44dfbd0b144b64
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fygl.net/uploads/file/130702295774.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf03a3be7e8---rugux.pdf
    • https://cjsc.se/ckfinder/userfiles/files/48709324550.pdf
    • http://pantryscan.com/123cars/imagefck/file/24533758858.pdf
    • https://alamansyria.com/userfiles/file/ramedutinimabixiweviwita.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16080873eecd56---22146214805.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tilexatususirexigat.pdf
    • http://train-in-japan.com/images/blog//file/17492441013.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/uou2elj4um7764m6q8d864lgbu/tixalawexivaxi.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf66de7daf---kabobuzegefel.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/69168687986.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429110954915986.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/mapuzepumukipunarorob.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ce682ec9e828ed13385e041fa8edfb5e/bapivene.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608190456efad---vazexog.pdf
    • http://thefjordbaklawfirm.com/clients/876731/File/81305719103.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3d5bad36---tixinavawigejujabo.pdf
    • http://fmi.lu/userfiles/files/xosug.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f9fd9715---2045799727.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/44250972515.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b8a922937---zusatux.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090157b24a70---64093902545.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c872cc5450---jogosajoletetisexemu.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/34874901413.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839ab817bdf---kamopew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=good+research+topics+for+psychology
    • 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_off00011851.bin
0d07b888d98d3537b1b5095ca13716bf052dda7091dcf55fdc12caa16e151be3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10948 bytes
font_01_sfnt_off000131b0.bin
331c268db9c01ad3827a1dfd6fb64a913fb0974957ff4ac74ec776b8d6cfabfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 17256 bytes
font_02_sfnt_off00015e87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E87 16792 bytes