Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6aa01c98ecb089…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 02:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f7fdeacc5ff35d83fd2e26b5bda8791 SHA-1: 0406b06832ca4c1af7c4030a53e0947b6800b5f6 SHA-256: 8e6aa01c98ecb0891387aeee3ee0fde786a9ca3f0bd1dacbb029972ca6765b66
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://yeosingol.com/FileData/ckfinder/files/20210806_3EA29EFF882A611C.pdf In PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/dff908ef0b1675ddf1ee40c816291b30/gidivazatawexadenipud.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/8962423674.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50169814917.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe92c0c543---95835169624.pdfIn PDF document text
    • http://underbutter.cz/download/foto/71348524934.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/33890526097.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/39351549103.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1b4af5c7483ad3c8044b96b54eb6e09b/65158247621.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/95388045042.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/vemakuxefo.pdfIn PDF document text
    • https://edusfera.pl/upload/file/26814232841.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93b7a149cd---sawifebemezazuzani.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610a28f327faf---jijifexat.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/74350869760.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/79ee593854c87fa99ad474f7e1f1b28e/nibumo.pdfIn PDF document text
    • https://tcremich.lu/files/files/zapidefaxivuriluwupadiper.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/3gremief0u1pufid7b51t4fpj1/27270062974.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/gepobafojenudijumepemiliv.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/u7s7uau4udef93ckbesfn9k5at/xugogozu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c34b1efd8698f75593b393988be18782/gafejolotupedi.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/foxukujepiran.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3889db62---kexibizedekukanojigedab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=observation+and+inference+worksheet+for+middle+school+pdfPDF link annotation
    • 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_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 11296 bytes
SHA-256: ef9c7a3a45e255057034149ab05d15b66cab7f8aa479f9a4e9cde141064181a5
font_01_sfnt_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 17572 bytes
SHA-256: 320d87c2db1c38a80212bab89920161dd2388207f40e3188916ef8422e601e8e