Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90955e4f0d57cb1…

MALICIOUS

PDF

110.7 KB Created: 2021-07-04 20:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7556a57696f46a11ecbcd32213fa0467 SHA-1: 926041e77f09a0b403a60ac0da9d9ab46dc7eb1e SHA-256: d90955e4f0d57cb1301f1686ba1f6aa905c6baf90c5ece2e44276b87d41feb00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort to distribute malicious links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • 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.
  • 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://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/uhtt9jorskop5v5jbr3hl4m82j/19080854768.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/21c84900bfe69b71f224dcd88df6dd5c/merikisogogisilebopa.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a1e93fcf---13667633840.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076883f3ffbb---39427884741.pdfIn PDF document text
    • http://calisnt.com/uploads/files/wesuf.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kipopenudusemivitumurus.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/97775578188.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/14104891691.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ff47e210---loxasefugenaz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10548652383.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/zudibaxekagizirevemem.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb342197a---fomukojefulobobeludikibuz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193a416d76---luxokijebopululosawo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085ffd00f413---52833570584.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812cf4e1fd4---fobezotazisa.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/70807152397.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/jnsqv7h98o0k5fffub5e494ca5/jonufuludajujus.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5f0d70205a9cd3c9e056e33699bfdb97/78390648510.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ac3a4d22942de5773547ed290648463/mafaboj.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/lunipibi.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/a59f71bab956fbf0ee5e2e593ed142df/90543103572.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/1526435384.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/zugojuzoporowimuxoxu.pdfIn PDF document text
    • https://bonacorsi.it/file/95468903056.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/322aaf7a165fa2d4fd78299cb7b7eee9/palatezeroputu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=siege+and+storm+series+orderPDF 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
font_00_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 18728 bytes
SHA-256: dc7cb208d063deeaab1e0d461985d0df382a8663e76c207e53e5f0d6c0c1186b
font_01_sfnt_off00015f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F7E 18456 bytes
SHA-256: 2a59aecc99c0481548fd07d7ddd05f1f84a358c9d2bb8e8d95e452ebef0a6e1f
font_02_sfnt_off00017cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000194e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194E9 10620 bytes
SHA-256: b73c02a09c6dc2ee993463d37172be856790afb05821a41438fd9aebedef55a9

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