Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e237815354ef8cc…

MALICIOUS

PDF

87.4 KB Created: 2021-08-30 17:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 644ed50c61be1e2c3329785ac6a1cd28 SHA-1: 0274895b55655adf6e832685b38fa396addfe965 SHA-256: 8e237815354ef8cc67c4fde76cd0bea8ca7c57c27b17ec77cdcb1d04846fb06c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8443

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 https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/325f834049b539acb9958389a0d6421d/damikojatizogibetiwa.pdf In PDF document text
    • http://iglozawiercie.pl/zdjecia/file/56785485263.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3e12c855---bafirolefagigubobebute.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/17590021508.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/35265876758.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/pofesufaritumu.pdfIn PDF document text
    • http://indecomavo.pl/inc/nuxamuvaw.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8fk8ftmun5n27i9s6qs024g8k4/vavukinogeburunizijerita.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/44859999981.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65da25390---manetapu.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f731f8bec428639e67f99f289c2b41bc/sekibukuvigimexulafivadu.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/sasap.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a871e2b20ac---67027321305.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/fitomelafesobubajipoxe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/55348855550.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/mukumutevidozumejem.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/afdc7b466b9a8084e97e5dc15ae8c7e6/rafedunipuxiva.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/95485578200.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/68315027576.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/47473173803.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/89289879980.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/rijobivawap.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/90179130831.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a5a4e0a56---nesuvozepe.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc4d774914---vikusoxabopokavirijozo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1355903cc1---35733898012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=example+of+a+judgementPDF link annotation
    • 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
stream_007_off00010101.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10101 17704 bytes
SHA-256: 8bf83ce1149695f34790ff5e95600f1c7cf3875407c88d74b23882da0cc37b78
font_00_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 10796 bytes
SHA-256: 0dfc6cf3fff73d0b9e2d56af9d74903a4b64ee844a46bc60ab12674c7f46b611
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 15760 bytes
SHA-256: 462233601992f87c794b9cce2d3a2377030e4fb98ff3f1793d5506c090de5a00
font_03_sfnt_off000144a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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