Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5891a3015ab8f4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 06:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c142ff4491949c1577613779cefddfa9 SHA-1: 9b0b8a1ec0b1c8bb036c31d5648f03b32bbee296 SHA-256: 4d5891a3015ab8f4632407f966946b6cbef53cbc4d7482fd018ec2a53752bf8f
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and links to compromised or disposable hosting sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware-hosting sites. The numerous URLs, many hosted on compromised WordPress sites, further support a phishing or distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e952206dc548d147fab33451cc4586c8/21235124683.pdf In PDF document text
    • http://peoplefoster.com/pliki/jemojadovozivumupedotusu.pdfIn PDF document text
    • https://dcimx.com/files/modonibitedadexamorar.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75686a9f0e---labizep.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f64c3e22---46635605162.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/8o02pfcif12fg90p8da94huc62/rapitoxaroneluxusoka.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b80894187---gafosupisete.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/gnskljsar7fid737c843bo4o42/37675470509.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/10462389585.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/bifirepilimedizonol.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r4rt3d4bdmlslrmqpne3rh9mo0/41017859557.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/6104002733.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/wakoxan.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/rowisinerabesepemonutop.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090112351273499.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202108131830026478.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/meloxituxemusukibota.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27580863877.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/96364bbe4cb5c0f0943af6abdc9fbaba/pugodisovafufurewelaf.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/55643369630.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dcb9fac3---12353373942.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/42174991545.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218c346c720---11282821704.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/lu2ccpjndvpqaqs996dqr46puc/75780093465.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99727d666---98298216768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=faded+spartito+violino+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_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 10536 bytes
SHA-256: 8aad0f26ee804b19cbaae7efc4623b93129bbd4cdab3320a7e6dceded41772b9
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 20012 bytes
SHA-256: 98b89972eca7bab9e6b2825383fe2e824617eb4214b92a48586d78f8995422c0
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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