Malicious PDF — malware analysis report

Static analysis result for SHA-256 6741d64a39ca0edd…

MALICIOUS

PDF

94.9 KB Created: 2021-06-29 00:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8ae42c5ceba6bbaab18abef71c693dfb SHA-1: a31eb9039a1ac883f8967b3b83560cac9f1d56fa SHA-256: 6741d64a39ca0edd4c89a5e23b80260cdc4b8f914cf6a67c9faaca9c89114737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an effort to obscure the ultimate destination. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://permargi.com/files/galeria/files/94784489913.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ftdl8e8brj5epas349f5e0pvi1/58710952936.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/nuvavufezibij.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/14126489109.pdfIn PDF document text
    • https://red-adlay.com/upload/files/95617156918.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/75c37dc77395fb98cb0abedafe291177/18009333946.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/zabutigixovuwemi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077434e5c690---65941777422.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c96694e27---vewadijuzegiposumelopog.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3143b30be6---gufewisivifajarulov.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e969c22e2f99ba8e49090f050e7bbe39/diruxesagebasikimudolisex.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9e0efafaee3487b5db539409c65d86b/mepumeviw.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m6uddc3lhnnhcnb2vegaifr2ui/gerevutiwizodevowalox.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/vovoguzezix.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/9069270991.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b091ef15121---damuletikarudepoduvidi.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/52635072494.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f9fac28b92179bb3c3188afe373ff827/8797984614.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/815ef5bdbc895cf71b745947b60b8a8e/19885557722.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/bb26ef2e0eea1ffc79ebc40ba1e3a0cb/53934717544.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c035a861cb0c4bd400e3f017a0fa704c/surovuledemuposibotevumu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a012653c38b---75013358095.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/xalotukujogowalezogadife.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6qfl5eb7b8u4jfcnbt9l3m5rfq/27147566344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=music+for+roblox+got+talent+pianoPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16808 bytes
SHA-256: 9ac07318b753ff258aa4dde0aa9fd96fe95649d4d9b8061d05aae7e181bb0d4c
font_01_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 10988 bytes
SHA-256: 7adfcf1e82be57279a326ad33711a3a1fc53aba2c3404bdbebc15c98fd22293b
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 1908 bytes
SHA-256: 3f3f9ae12e2cb3a6bdf2f70c64e4fc2dc250da62f347f4073d6305092870b54a
font_03_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 19552 bytes
SHA-256: dc4d67e1e769fd321b734ef6f48eafaa9fa5494d6b1f6878f6429c032308138c
font_04_sfnt_off00015522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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