Malicious PDF — malware analysis report

Static analysis result for SHA-256 efff42294382ae6d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 17:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da42354dc4ae58394c2ff00991ee00bc SHA-1: 7fa2035904f7116dba68c9a39b8514e137d63c4e SHA-256: efff42294382ae6d4f81f6004d5929981bcbb3a9cfac5eeeaa165716d150204a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e210f86fa9f---boleburofadutiz.pdf In PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/c0524e8d8f7558bd995fbb0b3f383fb5/14476964725.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/kuleg.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/putodowu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092793e77a04---wazedopilovazomuwabov.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610517e537e86---80997885061.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/thhg36mt4c2cfc8eolr97k50ua/5971945303.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/22904965402.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094df1f4a66c---norodizejiwinowugixad.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cabc0aac1---winuxodozosavuruse.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ed616f9eb899736f5e370da470002f40/55473168171.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/69291546592.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/18102577807.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774103c6aeb---20387929697.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/12991682339.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/51351566910.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ju9lkasckousu55j88jm3d1nta/lumavujuxogefefuzi.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051413293123.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/binarijadop.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/55550016686.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/saxetadu.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/sojemozunab.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/nobosuwipelas.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/wuditaxotomudiramaxar.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe56be048f---ravubawujixug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+space+race+worksheetPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 10372 bytes
SHA-256: 4927abc2145cdb5f0bc02d731f212f2c29983e42933a95fd37eac38b2dbedd0e
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 17920 bytes
SHA-256: 0c9c05137b67b8d392821a3a52834f9efcd225506b2d11dcc3f2f45aa4075707

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