Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa1e0211461c4f7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 07:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edc8ca9320a06209dd7886f87ae06321 SHA-1: 4b045de23f605028974a0f5fd0e78184b31a102a SHA-256: caa1e0211461c4f78acda16ebdefa50de8cf3a8606362bf9f49f8c8486eab4ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5b8d63e750b70de9f21387e7af250bbf/golokisonuga.pdf In PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8591226567.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/xukij.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/14122817787.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9149c24a7---14560129585.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210703_D5C0196382449FA4.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/xedowumunuto.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/merexilezibolomizud.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/kuvuvizuza.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/95933621747.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/nokinap.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/gomosi.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021080314492873499.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/32735104393.pdfIn PDF document text
    • https://aedwea.com/upload/foto/76909131122.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d7953ec58294980f25de4f6255594b4c/60930069402.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/penunun.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0532e5e38d---99600087920.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/zebefenesedag.pdfIn PDF document text
    • http://aweibel.com/Photo/file/52737158893.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/roxuvo.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/gojajadowib.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad784c394c---xudologax.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090116edcfb8---nugesagaseniwefipatovinen.pdfIn PDF document text
    • http://artside.org/data/temp/file/vajowapozomomatozapozivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=authorization+letter+for+claiming+documents+pdfPDF 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_off0000bf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 16960 bytes
SHA-256: d9fb541636611e4aa327e29ec1e73fcd9b1becc7e6d2ea6ac46541363ade2bbd
font_02_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 11208 bytes
SHA-256: cb13f9e2a0dd909c79ba96343becb86f9e53666c6a84f7541e7d22889fdad813

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