Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b83856652810160…

MALICIOUS

PDF

91.0 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: 61e668708b258524df2023d7e730fbd3 SHA-1: e45be1c2384a76b8f9ecd57a13011173f3aea18c SHA-256: 6b83856652810160b7507beb79a348fcfb90c2a954eb16c589cdc44078117663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of external links pointing to various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

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
  • 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://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://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 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