Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fa4d5cc4d2e2cb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 09:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b696613fa445cf61c4bf2b40a07825ef SHA-1: d4a4568a2ceefd5a1f52154fa9e5c0f4a6fe5383 SHA-256: 12fa4d5cc4d2e2cb2fac28b7287df78b5a220a4039b32e44e0427f071eed02b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the true destination. The document body is heavily obfuscated and unreadable, suggesting it's not meant for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8062173dd---badesapimefufemejixerufug.pdf In PDF document text
    • http://elskup.pl/images/assets/file/zibowoweda.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc7e999984---napipatizuwesegolumure.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8214dc9b4---rinikenafuzadekaxono.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ca4b7675---lixexexikowezazunofodazeb.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xugopidegawufafugapawib.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612194d924c43---2889927464.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/59001299211.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/92177968811.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763037ed60f---bigaxebakukatagapixop.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813decb14ca---kowoxijax.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/poranejanowoluzexebupi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nu1t787km5egdlj9kgg4oq9fn3/82568002650.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/25233335522.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rixed.pdfIn PDF document text
    • http://capital96.com/userfiles/file/12866069459.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/penavizafedefob.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/fupexodefasisipege.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/10890163303.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2446aa0c901f6c5230ba5bb2eca67f06/xenefetawovuru.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/wewusiwitagewa.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/47dn96egtchu0tpl8030fijsu3/xusitisa.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/jufuzazamupisulofusexi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f06f15c5366---tufizezomef.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160939fd89a1f9---witutuxedurewafovi.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7a35780f80d780fa95242f20cb357e1b/96754288904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=please+specify+in+tagalogPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 18848 bytes
SHA-256: b7b6af06e945521a71c1144d78ad52e725aa93a1f1607dd6583a83f8f89c4bfc
font_02_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 10672 bytes
SHA-256: 9d6f35d1a3413c8977d63bdbfecf787dcb55e86dd1dcca1c57eaa5ce5387a71b