Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb75b507cadd9dd…

MALICIOUS

PDF

170.0 KB Created: 2021-07-13 20:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7247b397acea3e8db1620ddcc1066f27 SHA-1: 14a2c2a038c17dd9c61127116e61cd3016625e90 SHA-256: cdb75b507cadd9dd724a8737eedff4efd499c10e7ea13d2a6d541470805244c8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those on potentially disposable hosting, suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

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://cjandjunemillerfarm.com/clients/75830/File/36175967629.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e4618e09640---difaba.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2b2c57fb---24954115252.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/lejubibuzapexatus.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/62927520778.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/875138911.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/01db6b03c2b227f3a25ec54f43225290/vipadis.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094888926fa5---13764638365.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/bewitosiza.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/milolo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc0f5e54e---favadomotevilugajepa.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c6a21f47b7cb81131711b7ea7de1b9b8/38730481098.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/66473254274.pdfIn PDF document text
    • http://eviinstall.com/userfiles/files/68966085133.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/dudemuzoseminog.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e80551a25---jiletiluxubetazole.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077732b366ea---rikugetekirefiliziregojaj.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/60925145450.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7039599041.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/37774422480.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7bee3a46---90143269400.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50078c4f2---kifutupufuwukexo.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6b4e5d24c3683936b7cf95bedfcfd03b/wuziwibajifojusurivi.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/21208545716.pdfIn PDF document text
    • https://brakos.it/file/66264322873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=could+you+elaborate+onPDF 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_off0002248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2248F 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_01_sfnt_off00023b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B7C 10368 bytes
SHA-256: 09af039490e5b48c835c3fde761cf2608e7872ef38c2e71309cb5e0b5a2613fb
font_02_sfnt_off00025313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25313 17760 bytes
SHA-256: 6056709a96449a7cf7251051cb0d902879b573d9011a7ac6417c83acdcd2e45b
font_03_sfnt_off0002819d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2819D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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