Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b6962a35bc8a4e…

MALICIOUS

PDF

95.2 KB Created: 2021-07-04 02:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33c85b39de72b7b1623c70cafadbda92 SHA-1: 5d133680668cb3de32f6dc6ad005a292db234cd9 SHA-256: 50b6962a35bc8a4e6a215200302d70b4208578a6c9fedec157297ece831beaac
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm hosted on compromised CMS uploads, directing users to multiple suspicious PDF files. The primary attack pattern involves luring users to these external links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc6e8da75---fodilopomedijuwesipotirag.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607858dd88785---pusuxiriritawutis.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/de1cf750ea4fa3b50acdc0898e0306f8/wukulokizinaw.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b85779d2---tinadu.pdf
    • https://psychologgia.pl/Upload/file/55115283755.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7a0d7a23949c915d327bf983b82a33fa/85726944867.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607747b7e4dc3---78255849062.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c3394302d7042de3f67468ef0c9e5430/fozinunisivugav.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/86240840157.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/28770272629.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e9c26a46---13057782250.pdf
    • https://rrr71.ru/upload_picture/26659310557.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce66f771a77---zitulejugepojupom.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/456d2d7ce3348223cf0a1ff7b426a111/45000132777.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbd901f653---buzefajuvujerelekifib.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/391b9f1f7063f1c495d35aee8f20886d/gaturareforoxanifesokukem.pdf
    • http://bulongvungtau.com/media/ftp/file/69745926741.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/121fq510i4ullm8igabtofocj3/rinugasitoxif.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6e1f1c304ce1bcc8ad812b04446a6fde/fisevarerad.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/73017039241.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3471a686bb---56235286940.pdf
    • http://www.moyekolodin.com/files/28946768773.pdf
    • http://cdhsalumni.com/clients/28864/File/40340818176.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/qn4g71hqenb1proaiuptgu0l1e/76213651773.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e463abe692---87878452939.pdf
    • https://bbpartner.cz/userfiles/file/15143408978.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5aec0e57---xubesufosebimifu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=strawberry+shortcake+cookie+bars
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f620.bin
bc5e8e590b825f4c558e45c48686b97019b4a2048dcfec865ca1c32c040dbc14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 10684 bytes
font_01_sfnt_off00010ee2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 16792 bytes
font_02_sfnt_off000126f4.bin
893bc75f958c6264ca2bbf0f150c3a4d04cba6497c605edc677405f02cb93b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 18640 bytes
font_03_sfnt_off00015852.bin
6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15852 16384 bytes

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