Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c6c5fb97650aa5…

MALICIOUS

PDF

78.1 KB Created: 2021-08-13 04:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e92dfccd4491f81074977a6ac30f6887 SHA-1: 61aa0fd974712fed6e3607b5d5993695715112ba SHA-256: 10c6c5fb97650aa5128d550368ab3f1a57de77a085db95f66dab14570bcc0035
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF is part of a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious files or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://konferencii.org/js/ckfinder/userfiles/files/35162328160.pdf In PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723cdf3236f---bazanemovedowidi.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kapawaluko.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/t8gqp8i90ufstn2d461qh4kb15/6414667347.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/tifenewerefekikurekimuk.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4112aa3288---2508772407.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14153a9d3f---95204128980.pdfIn PDF document text
    • http://fruitvita.com/files/files/duredazatuzabow.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/50530753692.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/regamidavudusivuzumab.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608265d11f8b1---72576577830.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/gonigemapemafaxozuf.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16085deba72993---71475243299.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/74bf4120c8320c264d2b96aa12e8391a/48419967637.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54a64bf88---59272488221.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/46766104354.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/jizirovif.pdfIn PDF document text
    • http://gptools.net/userfiles/file/93579023116.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/091e347c8167365f88986531ca969fe2/bufakasunipup.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8de66ba7f5---jevozezufebuf.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a23830bf68a142904fb387c0362757e2/45399312179.pdfIn PDF document text
    • http://valeneighbors.com/userimages/befubirezu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8ec2080edf012a258f5693fa52d6c4aa/kidoxupebolopagisu.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/68557889876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=metric+conversion+worksheet+1+answersPDF 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_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 15872 bytes
SHA-256: 61e308dacf2efa70fde204ff119824b9f0599b16450856f1872e757fc70a9362
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10568 bytes
SHA-256: ccad6260a3457d410c18fd99334734b3150a23696899f0adbd7a5c9b2e0e989e
font_02_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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