Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c39d6f65b566a8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 13:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 449db5e410dd4d4ce4a17b2302864fb5 SHA-1: a47978104dc504df1841fb72d59615e5cbe9bea0 SHA-256: 07c39d6f65b566a8d1c6899b8c830bc5893c8939bd0503420e8e9b74949b61df
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDF files hosted on compromised websites, suggesting a link farm or redirection chain. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=thoptv+apk+download+laptop PDF link annotation
    • http://iaestedresden.de/userfiles/file/figesozozuwam.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/raziluwojebibetexugale.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/bijobekas.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/84639965540.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/negapoxupilogutasukati.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/62476432705.pdfIn PDF document text
    • https://betsin.org/userfiles/files/wezodufola.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/75431647058.pdfIn PDF document text
    • https://capecoralliving.com/media/file/88814124445.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/58388565988.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb69be36e2---guduwofajuzerezaxolemakad.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60594508150.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/92532915560.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/af48928445071149af9f38a96a134c33/82922344740.pdfIn PDF document text
    • http://ktcz.eu/files/files/jefonedatevesebasarizeju.pdfIn PDF document text
    • http://moretonassets.net/userfiles/nuregule.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/tijewod.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161416b7d43418---10649467030.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210908_8827E871489BF61F.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/nubamed.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/43423343390.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/berefukelazebarigosubis.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/33757317467.pdfIn PDF document text
    • http://kvrhousing.com/uploads/rujinu.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 18608 bytes
SHA-256: f278c27d22aa1fb8f6890972d6dab5038c21451581bed35658cf2dccf3f4d54d
font_01_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 10204 bytes
SHA-256: a0e6c1609e6c060f8573d23e7ef61fd134238d530debce47a3da0038e8f33f6d
font_02_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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