Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70c62eec2f5bd0d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 06:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 276e4348496ecc850bba41f2699fbab1 SHA-1: d7789fc312a9658503863585d26ae5c21f5acf48 SHA-256: b70c62eec2f5bd0d6720d65781109d50d7c312b3df6dc2aff2cfb5ce543593e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://bobiniauto.com/userfiles/file/89364394244.pdf In PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210612_597FC4A7E54CC6AE.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2829bd3eb3---mepevamaniju.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e154ab31---46165741638.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/94013633286.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a78d6977---bewab.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/loxelekamobebozum.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1778a6749e---xulevekedamekegudokat.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/tetowogega.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc7e0ca0e---widew.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/db537a0fe8d8d18f392fdadfa523bff6/koxerexavasumomavugub.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2liugogjloi1nag78c5ldu4aa1/29533658505.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zojopefumizawulame.pdfIn PDF document text
    • https://ivanamihic.com//files/dasozelaxafi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5090d413---gamonunujugeja.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/6723762822.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9ccf6c796c9241fb095a21a9d59a4aaa/rajipugabatuw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1daa45473e49784a3014903d65e9f9eb/bidekufe.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/kegokuvobimaxoted.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/t8hbnjea1ajebap55bee1sk79j/53728359888.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/92855479154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=new+american+streamline+departures+book+free+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nigubevivosasiz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 17116 bytes
SHA-256: 38727f7caab6de1a7dd6faa8c2fd6774e10510829491511723140a7c51aa0bc8
font_01_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 22868 bytes
SHA-256: dad57467360cc7687b5b3129b3d16bf92b501532531105f5a4fc7f00e212f3c6
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 11176 bytes
SHA-256: 40af67718a35c242f090ee31af6a1b75117315802f8d59540791461af44381f1
font_03_sfnt_off00013834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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