Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c44cf4a7855a21…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 21:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0cc83b6d055e1cc4b38b6d105458d8bc SHA-1: 6ccda39ad566055c293b0233e5b4733ccbfcc8ab SHA-256: c8c44cf4a7855a21fef3840221371bc9e808d5fdeb0ca5b4158d2120a1721887
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded JavaScript, though not fully detailed, further supports its role as a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://queure.ru/uplcv?utm_term=manual+wheelchair+with+power+tilt PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160db994dcfed1---66409992181.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/68539941968.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/laderumilure.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/mevadavibalenokunem.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/femigolexegewelake.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078665bd1d7c---30373971228.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1c26fba475aed71988892aa7440f1a9d/dagulisek.pdfIn PDF document text
    • https://senfina.top/uploads/files/41124251520.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd6c4e42a---denagojosi.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/28967974299.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/waxuzujatuzamameti.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/nikowewewukijizefegu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf553ece1e6---wesizisuvidaxumazojer.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/269303932.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/43093615871.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/7299254389.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757edd19dfa---99493801261.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a61e614cf---26804390693.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afff782d324---folufok.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a911fd44---tavifi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d0143a1b---sutakufadejavosexusuko.pdfIn PDF document text
    • https://lecachet.fr/docs/files/54820327612.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_off0000c057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC057 15592 bytes
SHA-256: cab5f6b662bb53748ca89ae2c9cc27f5d5f0451d3f1d7d5828ad231cc8a9e906
font_01_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10484 bytes
SHA-256: f34ea01e2d412d06c59e36325ee82cfa3a3e139669875c68b283ccfcc7d3dbfd

Open this report in the interactive analyzer, or submit your own file for analysis.