Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b24974f110c7a53…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 23:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b281f4f2c3e94c80114ff2b4900d8ed8 SHA-1: 7acad9accc4ad5e19011547ca6c7be0e8f8e3247 SHA-256: 4b24974f110c7a53a1948d00aa43c011c41f653d8081803eac36dec9a0a8a94c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded URLs are consistent with a spearphishing attachment used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=harvard+mba+employment+report+pdf PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609253fad2d85---sizelepifuvuvo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e949f3fbb06d564f4896758e9898acca/vurukikowefuleval.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/82843281623.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf454d2518---55716594448.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/41963922a5209c3aab89d31b575e8a1c/32710384094.pdfIn PDF document text
    • http://leton.pl/userfiles/file/pagagijive.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f72114f3e---zunupuk.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/rikujekovuxebasukezikek.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xenokifegakikujuvoga.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/vawulekavomudolelinone.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3631bc87c3cbdfc583e280b4824a7ffe/fifofekibenamim.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/75564056589.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/98c5d915195e217d6af912f8d208e5e3/kidofesakebofufej.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7818924e5---vixakadinivokogomenivupus.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/25611535839.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zekonemedisudowu.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/sagosilesiwu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f56cae8916f340e44d85a7721c715094/72886839852.pdfIn PDF document text
    • https://everestart.com/images/stories/file/93424573356.pdfIn PDF document text
    • https://tmtteks.com/files/tosafo.pdfIn PDF document text
    • http://newcityhk.com/userfiles/67387393294.pdfIn PDF document text
    • https://goodline.by/userfiles/file/vabazokakokeluponumulotu.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/parosixexumimupidokuweb.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fc1fd9822---75803949388.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lekewezezosapepupigu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/61693819740.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ad44e475---wazijis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 10708 bytes
SHA-256: b43f19458f963ac78374e69d0b42153566ef72df228e8b9a0176377734ae320d
font_02_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 18272 bytes
SHA-256: 789512a82203acc55b5b8695043349751e65cf3eed88812bff675f848f8cc1f9

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