Malicious PDF — malware analysis report

Static analysis result for SHA-256 421b0027f3ee67ee…

MALICIOUS

PDF

86.6 KB Created: 2021-07-15 10:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffc0b4994ee6194363253946c8af5bb1 SHA-1: 1ca9d83c361c803d82956d7f014232ba304af694 SHA-256: 421b0027f3ee67ee899ed8f6f5b0712f3b592503a9076f0ddd9356e58d49afc0
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or hosting for malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=employment+notice+period+meaning
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085922a14488---kivirubar.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60b53260ba---72840561872.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24614cad2f---kutotigorenanujaf.pdf
    • http://komputerzagrosze.pl/userfiles/file/6581997290.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2b73403eecc3c6996e680ecdd3281264/gajiro.pdf
    • https://cometsecurity.in/admin/userfiles/file/41823244225.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/68956734476.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfbd8acf4f---93971653287.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f6e4ec59a---vuvixawuwatepubixijirafuf.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ca5dd67d44a1e8e26cbf74ec176ef3c9/21153550602.pdf
    • http://baocaosudanang24h.com/uploads/image/files/96920527971.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/852be0be006044321aa5d10516e8cd11/78147695252.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160939ee05480b---tusunuzilasopaka.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2a577c91---77009149943.pdf
    • http://nadiadsa.org/userfiles/file/72100478181.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ee0c8b21139c8051c97c2529fa6c1c95/84944379478.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r473rdg84hcdnv883612g7j61k/21898765155.pdf
    • https://dm288.com/slicice/file/31230199335.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/faralofomorowale.pdf
    • http://travelport.pl/userfiles//file/96524974592.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f0f4be3d8007359d5761e287c63bbe7/93567532630.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f15d35766---desesifebojunorepubuveva.pdf
    • http://skiflogistics.ru/userfiles/file/63717992253.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f5546709ea48aedde57daa333914cbe7/4913959259.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1ah7lrda0rmpd7mnc2old4nm7r/sukexalebamapuxe.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/24565353609.pdf
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/94478832067.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd97ae920---61256283053.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7c.bin
751a4b19bf4398aad1f62ff76ce34dac62c425c7323116a3febafb6d5e927ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10784 bytes
font_01_sfnt_off0001060e.bin
84bd4d2dd9cbcbfc7b3d9359f537eac332cffed5500b2b5c9251ce1d3e71550e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 17708 bytes
font_02_sfnt_off0001330a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 16792 bytes