Malicious PDF — malware analysis report

Static analysis result for SHA-256 100ee8b8594f8d40…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 18:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d0e3fff318de725fdbf9e532947f6bbd SHA-1: 0883dca76f9366822b096f4b0f04f43730a4357c SHA-256: 100ee8b8594f8d40a122ed4ac0caf7082ae7ae24eda3dfcca667d3def5be6222
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous URLs hosted on compromised or disposable domains. This behavior is characteristic of phishing campaigns or malware distribution schemes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://prcomponents.com/ckfinder/userfiles/files/91785321557.pdf In PDF document text
    • http://wowbond.com/upload/Fckeditor/file/monuxefedazeremorex.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/tesixem.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zejeposorojimuzul.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gtvbpp67pvu4qd443q7nohc5a4/36975428806.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/96505493887.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cc30088e06037e74f5d464ef7f5648e6/dijetivuraditexasodibabuz.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8j4nusl3v9lpo1b21umpmoqdc4/denigitodisexipikawe.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a84df5d531ff2d6992b1896b540afa0d/jobirumuligolanojukopa.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cdjrgieit9m5se6djlbrnrbg7/64074489904.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bobodutenimanunobobokifa.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/bipotaxodozaluri.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ii4j2d7joe2bhaj6mjnqt2lsac/gukapajokezu.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/nabebafezakijetidopuwevi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tirimoxibugebojenosovarak.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/3636115161.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/58213874006.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/15076295776.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jevutuwe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb85318efb---mofalawevo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ae5e37dd571af60289e94c563565b740/paxivowisukijusewij.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bc3902fbd---jujamurupedumaburobej.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607adab893457---zogumamadiza.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087271c4bbcd---78997657600.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7a9c2af41de355654becb9f8f91eee1b/rigasitesalem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=java+char+to+stringPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 10388 bytes
SHA-256: 42bf6fdb61e0f21abf4f8935e5467316b40afbc862a7cfaad555cd4da6e06abd
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 17652 bytes
SHA-256: 00a8cc74c16d46ddc7603837e6973fb78d1a26b02fac615fc1d34cd6c06e7905
font_02_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 16076 bytes
SHA-256: 9dc74535a6692f4260f0355970fcc7bc2a5c5af40b851cc3ce6f07945a46146e

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